Update README

Author: jondubois

README.md

@@ -43,9 +43,3 @@ function wait(duration) {
   });
 }
 ```
-
-Note that unlike with `EventEmitter`, you cannot get the count for the number of active listeners at any given time.
-This is intentional as it encourages code to be written in a more declarative style and lowers the risk of memory leaks.
-
-If you want to track listeners, you should do it yourself.
-The new ECMAScript `Symbol` type should make tracking object references easier: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol