Update ESLint to latest version

Author: limzykenneth

.eslintrc .eslintrc.json

@@ -47,6 +47,8 @@
     "object-curly-spacing": ["error", "always"],
     "arrow-parens": ["error", "as-needed"],
     "linebreak-style": ["error", "unix"],
-    "no-trailing-spaces": ["error"]
+    "no-trailing-spaces": ["error"],
+    "no-prototype-builtins": "off",
+    "no-async-promise-executor": "off"
   }
 }

Gruntfile.js

@@ -98,11 +98,11 @@ module.exports = grunt => {
         ]
       },
       source: {
-        options: {
-          parserOptions: {
-            ecmaVersion: 8
-          }
-        },
+        // options: {
+        //   parserOptions: {
+        //     ecmaVersion: 8
+        //   }
+        // },
         src: ['src/**/*.js']
       },
       test: {