⬆️ 👕 updated to eslint 2.1.0

Verified migration doc (nothing to be done)
http://eslint.org/docs/user-guide/migrating-to-2.0.0

And made sure the eslint tasks passed

spec/fixtures/workers/worker.js

@@ -1,3 +1,3 @@
 this.onmessage = function(msg) {
   this.postMessage(msg.data);
-}
+};