chore(event): cleanup commented out code (testing-library#425)

* chore(events): cleanup commented out code

* chore(README): update contributors

* Revert "chore(README): update contributors"

This reverts commit d4033cf.

Author: JonathanStoye

src/events.js

@@ -210,10 +210,6 @@ const eventMap = {
     EventType: 'Event',
     defaultInit: {bubbles: false, cancelable: false},
   },
-  // error: {
-  //   EventType: Event,
-  //   defaultInit: {bubbles: false, cancelable: false},
-  // },
   loadedData: {
     EventType: 'Event',
     defaultInit: {bubbles: false, cancelable: false},