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/util/Constants.js

@@ -329,6 +329,18 @@ exports.WSEvents = {
   RELATIONSHIP_REMOVE: 'RELATIONSHIP_REMOVE',
 };
 
+/**
+ * The type of a message, e.g. `DEFAULT`. Here are the available types:
+ * - DEFAULT
+ * - RECIPIENT_ADD
+ * - RECIPIENT_REMOVE
+ * - CALL
+ * - CHANNEL_NAME_CHANGE
+ * - CHANNEL_ICON_CHANGE
+ * - PINS_ADD
+ * - GUILD_MEMBER_JOIN
+ * @typedef {string} MessageType
+ */
 exports.MessageTypes = [
   'DEFAULT',
   'RECIPIENT_ADD',