Merge pull request #1025 from hedgedoc/1.x/replace-request

[1.x] Dependencies: Replace deprecated request library with node-fetch

package.json

@@ -91,6 +91,7 @@
     "moment": "^2.17.1",
     "morgan": "^1.7.0",
     "mysql2": "^2.0.0",
+    "node-fetch": "^2.6.1",
     "passport": "^0.4.0",
     "passport-dropbox-oauth2": "^1.1.0",
     "passport-facebook": "^3.0.0",
@@ -110,7 +111,6 @@
     "randomcolor": "^0.6.0",
     "raphael": "^2.3.0",
     "readline-sync": "^1.4.7",
-    "request": "^2.88.0",
     "reveal.js": "^3.9.2",
     "rimraf": "^3.0.2",
     "scrypt-async": "^2.0.1",