Update main file

Author: BillyFrcs

package.json

@@ -2,7 +2,7 @@
   "name": "notesappback-end",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "server.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "start":"NODE_ENV=production node ./src/server.js",