Fix kick_chat_member decription

Fix kick_chat_member return value type description (should be boolean according to API and is boolean by fact).

telebot/__init__.py

@@ -723,7 +723,7 @@ class TeleBot:
         :param user_id: Int : Unique identifier of the target user
         :param until_date: Date when the user will be unbanned, unix time. If user is banned for more than 366 days or
                less than 30 seconds from the current time they are considered to be banned forever
-        :return: types.Message
+        :return: boolean
         """
         return apihelper.kick_chat_member(self.token, chat_id, user_id, until_date)