fix(socketio#4681): socket.io private chat example outdated

Author: haneenmahd

examples/private-messaging-vue/package.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "serve": "vue-cli-service serve",
+    "serve": "NODE_OPTIONS=--openssl-legacy-provider vue-cli-service serve",
     "build": "vue-cli-service build",
     "lint": "vue-cli-service lint"
   },
@@ -40,4 +40,4 @@
     "last 2 versions",
     "not dead"
   ]
-}
+}