fix(cli-plugin-eslint): set parserOptions.ecmaVersion to 2017

LinusBorg · web-flow · commit 9a65acefb3eb · 2018-07-31T09:21:03.000+02:00
This keeps eslint from complaining about newser syntax like async/await
diff --git a/packages/@vue/cli-plugin-eslint/eslintOptions.js b/packages/@vue/cli-plugin-eslint/eslintOptions.js
@@ -10,7 +10,8 @@ exports.config = api => {
   }
   if (!api.hasPlugin('typescript')) {
     config.parserOptions = {
-      parser: 'babel-eslint'
+      parser: 'babel-eslint',
+      ecmaVersion: 2017,
     }
   }
   return config
