Add support to edit emojis (#1142)

* Add support to edit emojis

* Fixes for coding style.

* Add and use guildEmoji constants for updateEmoji

* Just use the Constant

* Fix typo in edit documentation

* Specify property types

* Fix ridiculous typo.

* Update Emoji.js

src/client/ClientDataManager.js

@@ -123,6 +123,7 @@ class ClientDataManager {
     const oldEmoji = cloneObject(currentEmoji);
     currentEmoji.setup(newData);
     this.client.emit(Constants.Events.GUILD_EMOJI_UPDATE, oldEmoji, currentEmoji);
+    return currentEmoji;
   }
 }