build(.eslintrc): set es6: true

Author: jedwards1211

.eslintrc

@@ -2,5 +2,8 @@
   "extends": [
     "@jedwards1211/eslint-config", "@jedwards1211/eslint-config-flow"
   ],
-  "parser": "babel-eslint"
+  "parser": "babel-eslint",
+  "env": {
+    "es6": true
+  }
 }