Add Object rest spread to eslint and babel configs

Also change from `eslint-plugin-html` to `eslint-plugin-vue`

.eslintrc.json

@@ -1,6 +1,9 @@
 {
     "root": true,
     "parserOptions": {
+        "ecmaFeatures": {
+            "experimentalObjectRestSpread": true
+        },
         "ecmaVersion": 6,
         "sourceType": "module"
     },
@@ -8,11 +11,12 @@
         "browser": true
     },
     "extends": "eslint:recommended",
-    "plugins": [ "html" ],
+    "plugins": ["vue"],
     "rules": {
         "indent": ["error", 4, { "SwitchCase": 1 }],
         "quotes": ["error", "single"],
         "semi": ["error", "always"],
+        "vue/jsx-uses-vars": 2,
         "no-console": ["error"]
     }
 }