bump deps

.eslintrc.json

 {
-  "parserOptions": {
-    "ecmaVersion": 6,
-    "sourceType": "module"
-  },
-
   "env": {
-    "node": true,
-    "es6": true
+    "node": true
   },
 
   "extends": [
-    "sidvind/es6"
+    "sidvind/es2015"
   ],
 
   "rules": {

package.json

@@ -30,7 +30,7 @@
     "html-validate": ">=0.8.0 <1.0.0"
   },
   "devDependencies": {
-    "eslint": "^4.8.0",
-    "eslint-config-sidvind": "^1.2.0"
+    "eslint": "^4.19.1",
+    "eslint-config-sidvind": "^1.3.1"
   }
 }