simpler eslint config for es6 features

.eslintrc

@@ -1,28 +1,10 @@
 env:
   browser: true
+  es6: true
 
 parser: babel-eslint
-
 plugins: [ "react" ]
 
-# enable ECMAScript features
-ecmaFeatures:
-  arrowFunctions: true
-  binaryLiterals: true
-  blockBindings: true
-  classes: true
-  defaultParams: true
-  destructuring: true
-  forOf: true
-  generators: true
-  jsx: true
-  modules: true
-  objectLiteralShorthandMethods: true
-  objectLiteralShorthandProperties: true
-  octalLiterals: true
-  spread: true
-  templateStrings: true
-
 rules:
   # Possible Errors
   # https://github.com/eslint/eslint/tree/master/docs/rules#possible-errors