events: deprecate require('events').EventEmitter

recommend developers to use `require('events')`.

Author: JacksonTian

lib/events.js

@@ -8,8 +8,13 @@ function EventEmitter() {
 }
 module.exports = EventEmitter;
 
-// Backwards-compat with node 0.10.x
-EventEmitter.EventEmitter = EventEmitter;
+Object.defineProperty(EventEmitter, 'EventEmitter', {
+  get: internalUtil.deprecate(function() {
+    return EventEmitter;
+  },
+  `require('events').EventEmitter is deprecated.` +
+  `Use require('events') instead.`)
+});
 
 EventEmitter.usingDomains = false;