fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-PRISMJS-2404333

package-lock.json

@@ -19,10 +19,10 @@
         "mathjax-node": "^2.1.1",
         "ncp": "^2.0.0",
         "node-prismjs": "^0.1.0",
-        "prismjs": "^1.23.0",
+        "prismjs": "^1.27.0",
         "redis": "^3.0.2",
         "rss": "^1.2.2",
-        "showdown": "^2.0.2"
+        "showdown": "^1.9.1"
       },
       "devDependencies": {
         "coveralls": "^3.0.4",
@@ -1432,6 +1432,14 @@
         "node": ">=6"
       }
     },
+    "node_modules/camelcase": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/capture-exit": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/capture-exit/-/capture-exit-2.0.0.tgz",
@@ -1495,15 +1503,33 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/clipboard": {
+    "node_modules/cliui": {
-      "version": "1.7.1",
+      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-1.7.1.tgz",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
-      "integrity": "sha1-Ng1taUbpmnof7zleQrqStem1oWs=",
+      "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
-      "optional": true,
       "dependencies": {
-        "good-listener": "^1.2.2",
+        "string-width": "^3.1.0",
-        "select": "^1.1.2",
+        "strip-ansi": "^5.2.0",
-        "tiny-emitter": "^2.0.0"
+        "wrap-ansi": "^5.1.0"
+      }
+    },
+    "node_modules/cliui/node_modules/ansi-regex": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/cliui/node_modules/strip-ansi": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+      "dependencies": {
+        "ansi-regex": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=6"
       }
     },
     "node_modules/co": {
@@ -1767,7 +1793,6 @@
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
-      "dev": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -1857,12 +1882,6 @@
         "node": ">=0.4.0"
       }
     },
-    "node_modules/delegate": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/delegate/-/delegate-3.2.0.tgz",
-      "integrity": "sha512-IofjkYBZaZivn0V8nnsMJGBr4jVLxHDheKSW88PyxS5QC4Vo9ZbZVvhzlSxY87fVq3STR6r+4cGepyHkcWOQSw==",
-      "optional": true
-    },
     "node_modules/denque": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/denque/-/denque-1.5.0.tgz",
@@ -1974,8 +1993,7 @@
     "node_modules/emoji-regex": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-      "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+      "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA=="
-      "dev": true
     },
     "node_modules/encodeurl": {
       "version": "1.0.2",
@@ -2956,6 +2974,17 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/find-up": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+      "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+      "dependencies": {
+        "locate-path": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/flat-cache": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-3.0.4.tgz",
@@ -3837,6 +3866,14 @@
       "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=",
       "dev": true
     },
+    "node_modules/get-caller-file": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
+      "integrity": "sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==",
+      "engines": {
+        "node": "6.* || 8.* || >= 10.*"
+      }
+    },
     "node_modules/get-intrinsic": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.1.1.tgz",
@@ -3944,15 +3981,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/good-listener": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/good-listener/-/good-listener-1.2.2.tgz",
-      "integrity": "sha1-1TswzfkxPf+33JoNR3CWqm0UXFA=",
-      "optional": true,
-      "dependencies": {
-        "delegate": "^3.1.2"
-      }
-    },
     "node_modules/graceful-fs": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.2.tgz",
@@ -5789,6 +5817,18 @@
         "node": ">=4"
       }
     },
+    "node_modules/locate-path": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+      "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+      "dependencies": {
+        "p-locate": "^3.0.0",
+        "path-exists": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/lodash": {
       "version": "4.17.21",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
@@ -6168,14 +6208,6 @@
         "prismjs": "^1.5.0"
       }
     },
-    "node_modules/node-prismjs/node_modules/prismjs": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.6.0.tgz",
-      "integrity": "sha1-EY2V+3pm26InLjQ7NF9SNmWds2U=",
-      "optionalDependencies": {
-        "clipboard": "^1.5.5"
-      }
-    },
     "node_modules/normalize-package-data": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/normalize-package-data/-/normalize-package-data-2.5.0.tgz",
@@ -6372,6 +6404,28 @@
         "node": ">=4"
       }
     },
+    "node_modules/p-limit": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+      "dependencies": {
+        "p-try": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/p-locate": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+      "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+      "dependencies": {
+        "p-limit": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/p-reduce": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/p-reduce/-/p-reduce-1.0.0.tgz",
@@ -6381,6 +6435,14 @@
         "node": ">=4"
       }
     },
+    "node_modules/p-try": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+      "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/parent-module": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
@@ -6432,7 +6494,6 @@
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
       "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
-      "dev": true,
       "engines": {
         "node": ">=4"
       }
@@ -6633,22 +6694,11 @@
       }
     },
     "node_modules/prismjs": {
-      "version": "1.23.0",
+      "version": "1.27.0",
-      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.23.0.tgz",
+      "resolved": "https://registry.npmjs.org/prismjs/-/prismjs-1.27.0.tgz",
-      "integrity": "sha512-c29LVsqOaLbBHuIbsTxaKENh1N2EQBOHaWv7gkHN4dgRbxSREqDnDbtFJYdpPauS4YCplMSNCABQ6Eeor69bAA==",
+      "integrity": "sha512-t13BGPUlFDR7wRB5kQDG4jjl7XeuH6jbJGt11JHPL96qwsEHNX2+68tFXqc1/k+/jALsbSWJKUOT/hcYAZ5LkA==",
-      "optionalDependencies": {
+      "engines": {
-        "clipboard": "^2.0.0"
+        "node": ">=6"
-      }
-    },
-    "node_modules/prismjs/node_modules/clipboard": {
-      "version": "2.0.6",
-      "resolved": "https://registry.npmjs.org/clipboard/-/clipboard-2.0.6.tgz",
-      "integrity": "sha512-g5zbiixBRk/wyKakSwCKd7vQXDjFnAMGHoEyBogG/bw9kTD9GvdAvaoRR1ALcEzt3pVKxZR0pViekPMIS0QyGg==",
-      "optional": true,
-      "dependencies": {
-        "good-listener": "^1.2.2",
-        "select": "^1.1.2",
-        "tiny-emitter": "^2.0.0"
       }
     },
     "node_modules/process-nextick-args": {
@@ -7055,7 +7105,6 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
       "integrity": "sha1-jGStX9MNqxyXbiNE/+f3kqam30I=",
-      "dev": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -7069,6 +7118,11 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/require-main-filename": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
+      "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg=="
+    },
     "node_modules/resolve": {
       "version": "1.12.0",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.12.0.tgz",
@@ -7289,12 +7343,6 @@
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
       "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw=="
     },
-    "node_modules/select": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/select/-/select-1.1.2.tgz",
-      "integrity": "sha1-DnNQrN7ICxEIUoeG7B1EGNEbOW0=",
-      "optional": true
-    },
     "node_modules/semver": {
       "version": "5.7.1",
       "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
@@ -7349,8 +7397,7 @@
     "node_modules/set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
-      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc="
-      "dev": true
     },
     "node_modules/set-value": {
       "version": "2.0.1",
@@ -7412,26 +7459,16 @@
       "dev": true
     },
     "node_modules/showdown": {
-      "version": "2.0.2",
+      "version": "1.9.1",
-      "resolved": "https://registry.npmjs.org/showdown/-/showdown-2.0.2.tgz",
+      "resolved": "https://registry.npmjs.org/showdown/-/showdown-1.9.1.tgz",
-      "integrity": "sha512-4z4aAfKk6WdDKGYYpBcdTovTSw/ock6/fg363pR4JECnEMbnFfwSV2B59IfesQQ6hTRVEebx7VXxMm0/KiAUgg==",
+      "integrity": "sha512-9cGuS382HcvExtf5AHk7Cb4pAeQQ+h0eTr33V1mu+crYWV4KvWAw6el92bDrqGEk5d46Ai/fhbEUwqJ/mTCNEA==",
-      "license": "MIT",
       "dependencies": {
-        "commander": "^9.0.0"
+        "yargs": "^14.2"
       },
       "bin": {
         "showdown": "bin/showdown.js"
       }
     },
-    "node_modules/showdown/node_modules/commander": {
-      "version": "9.5.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-9.5.0.tgz",
-      "integrity": "sha512-KRs7WVDKg86PWiuAqhDrAQnTXZKraVcCc6vFdL14qrZ/DcWwuRo7VoiYXalXO7S5GKpqYiVEwCbgFDfxNHKJBQ==",
-      "license": "MIT",
-      "engines": {
-        "node": "^12.20.0 || >=14"
-      }
-    },
     "node_modules/signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
@@ -7850,6 +7887,38 @@
         "node": ">=4"
       }
     },
+    "node_modules/string-width": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+      "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+      "dependencies": {
+        "emoji-regex": "^7.0.1",
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^5.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/string-width/node_modules/ansi-regex": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/string-width/node_modules/strip-ansi": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+      "dependencies": {
+        "ansi-regex": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/string.prototype.trimleft": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.0.tgz",
@@ -8196,12 +8265,6 @@
       "integrity": "sha1-iQN8vJLFarGJJua6TLsgDhVnKmo=",
       "dev": true
     },
-    "node_modules/tiny-emitter": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.1.0.tgz",
-      "integrity": "sha512-NB6Dk1A9xgQPMoGqC5CVXn123gWyte215ONT5Pp5a0yt4nlEoO1ZWeCwpncaekPHXO60i47ihFnZPiRPjRMq4Q==",
-      "optional": true
-    },
     "node_modules/tmpl": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
@@ -8629,8 +8692,7 @@
     "node_modules/which-module": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
-      "dev": true
     },
     "node_modules/word-wrap": {
       "version": "1.2.3",
@@ -8646,6 +8708,38 @@
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
     },
+    "node_modules/wrap-ansi": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+      "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
+      "dependencies": {
+        "ansi-styles": "^3.2.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/ansi-regex": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/strip-ansi": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+      "dependencies": {
+        "ansi-regex": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -8695,14 +8789,40 @@
     "node_modules/y18n": {
       "version": "4.0.1",
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+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -15585,14 +15756,40 @@
     "y18n": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
-      "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==",
+      "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ=="
-      "dev": true
     },
     "yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
       "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
       "dev": true
+    },
+    "yargs": {
+      "version": "14.2.3",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
+      "integrity": "sha512-ZbotRWhF+lkjijC/VhmOT9wSgyBQ7+zr13+YLkhfsSiTriYsMzkTUFP18pFhWwBeMa5gUc1MzbhrO6/VB7c9Xg==",
+      "requires": {
+        "cliui": "^5.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^15.0.1"
+      }
+    },
+    "yargs-parser": {
+      "version": "15.0.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
+      "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
     }
   }
 }

package.json

@@ -13,10 +13,10 @@
     "mathjax-node": "^2.1.1",
     "ncp": "^2.0.0",
     "node-prismjs": "^0.1.0",
-    "prismjs": "^1.23.0",
+    "prismjs": "^1.27.0",
     "redis": "^3.0.2",
     "rss": "^1.2.2",
-    "showdown": "^2.0.2"
+    "showdown": "^1.9.1"
   },
   "devDependencies": {
     "coveralls": "^3.0.4",