Added Client#status and Message#type typedefs (#1571)

* typedef for MessageTypes and linked Client#status to Status

* should be singular

* typedef for Voiceconnection#status

src/client/voice/VoiceConnection.js

@@ -52,7 +52,7 @@ class VoiceConnection extends EventEmitter {
 
     /**
      * The current status of the voice connection
-     * @type {number}
+     * @type {VoiceStatus}
      */
     this.status = Constants.VoiceStatus.AUTHENTICATING;