chore: point towards the v4 branch

package-lock.json

@@ -3900,9 +3900,8 @@
       }
     },
     "engine.io": {
-      "version": "3.4.0",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-3.4.0.tgz",
-      "integrity": "sha512-XCyYVWzcHnK5cMz7G4VTu2W7zJS7SM1QkcelghyIk/FmobWBtXE7fwhBusEKvCSqc3bMh8fNFMlUkCKTFRxH2w==",
+      "version": "git+https://github.com/socketio/engine.io.git#f3c291fa613a9d50c924d74293035737fdace4f2",
+      "from": "git+https://github.com/socketio/engine.io.git#v4",
       "dev": true,
       "requires": {
         "accepts": "~1.3.4",
@@ -3922,9 +3921,8 @@
       }
     },
     "engine.io-parser": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/engine.io-parser/-/engine.io-parser-2.2.0.tgz",
-      "integrity": "sha512-6I3qD9iUxotsC5HEMuuGsKA0cXerGz+4uGcXQEkfBidgKf0amsjrrtwcbwK/nzpZBxclXlV7gGl9dgWvu4LF6w==",
+      "version": "git+https://github.com/socketio/engine.io-parser.git#a947ae59a2844e4041db58ff36b270d1528b3bee",
+      "from": "git+https://github.com/socketio/engine.io-parser.git#v4",
       "requires": {
         "after": "0.8.2",
         "arraybuffer.slice": "~0.0.7",

package.json

@@ -26,7 +26,7 @@
   "dependencies": {
     "component-emitter": "1.2.1",
     "debug": "~4.1.0",
-    "engine.io-parser": "~2.2.0",
+    "engine.io-parser": "git+https://github.com/socketio/engine.io-parser.git#v4",
     "has-cors": "1.1.0",
     "indexof": "0.0.1",
     "parseqs": "0.0.5",
@@ -44,7 +44,7 @@
     "concat-stream": "^1.6.0",
     "del": "^2.2.2",
     "derequire": "^2.0.6",
-    "engine.io": "3.4.0",
+    "engine.io": "git+https://github.com/socketio/engine.io.git#v4",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.9.0",
     "expect.js": "^0.3.1",