Add object-shorthand rule as warning

Author: LinusU

.eslintrc.json

@@ -26,6 +26,7 @@
 
   "rules": {
     "no-var": "warn",
+    "object-shorthand": ["warn", "properties"],
 
     "accessor-pairs": ["error", { "setWithoutGet": true, "enforceForClassMembers": true }],
     "array-bracket-spacing": ["error", "never"],