Add missing 'use' clause for Hidekeyboard command.

Fixes #137

examples/Commands/HidekeyboardCommand.php

@@ -11,8 +11,9 @@
 namespace Longman\TelegramBot\Commands\UserCommands;
 
 use Longman\TelegramBot\Commands\UserCommand;
-use Longman\TelegramBot\Request;
+use Longman\TelegramBot\Entities\ReplyKeyboardHide;
 use Longman\TelegramBot\Entities\ReplyKeyboardMarkup;
+use Longman\TelegramBot\Request;
 
 /**
  * User "/hidekeyboard" command