⬆️ 👕 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/shared_worker.js

@@ -1,7 +1,7 @@
-onconnect = function(event) {
+this.onconnect = function(event) {
   var port = event.ports[0];
   port.start();
   port.onmessage = function(event) {
     port.postMessage(event.data);
-  }
-}
+  };
+};