default channel doesn't exist anymore (#1738)

src/structures/Guild.js

@@ -312,15 +312,6 @@ class Guild {
     return this.client.voice.connections.get(this.id) || null;
   }
 
-  /**
-   * The `#general` TextChannel of the guild
-   * @type {TextChannel}
-   * @readonly
-   */
-  get defaultChannel() {
-    return this.channels.get(this.id);
-  }
-
   /**
    * The position of this guild
    * <warn>This is only available when using a user account.</warn>