fix: upgrade express from 4.17.1 to 4.17.2

Snyk has created this PR to upgrade express from 4.17.1 to 4.17.2.

See this package in npm:
https://www.npmjs.com/package/express

See this project in Snyk:
https://app.snyk.io/org/klemek/project/cedd5eae-8053-409b-b6e9-d7e490570c4e?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -4,7 +4,7 @@
   "description": "my first socket.io app",
   "dependencies": {
     "color-convert": "^1.9.3",
-    "express": "^4.17.1",
+    "express": "^4.17.2",
     "socket.io": "^3.0.0"
   }
 }