Core: Add plugin eslint-plugin-json (#7869)

* Add plugin eslint-plugin-json

Add plugin eslint-plugin-json for parse build/salad.config.json

* Add plugin eslint-plugin-json

Add plugin eslint-plugin-json for parse build/salad.config.json

.eslintrc

@@ -6,7 +6,7 @@
     "expect": true,
     "sinon": true
   },
-  "plugins": ['vue'],
+  "plugins": ['vue','json'],
   "extends": 'elemefe',
   "parserOptions": {
     "ecmaFeatures": {

package.json

@@ -82,6 +82,7 @@
     "css-loader": "^0.28.7",
     "es6-promise": "^4.0.5",
     "eslint": "^3.10.2",
+    "eslint-plugin-json": "^1.2.0",
     "extract-text-webpack-plugin": "^3.0.1",
     "file-loader": "^1.1.5",
     "file-save": "^0.2.0",