Add new methods available at API 6.8

lib/telegram/bot/client/api_methods.txt

@@ -1,5 +1,5 @@
 # Generated with bin/fetch-telegram-methods
-# Bot API 6.6
+# Bot API 6.8
 
 getUpdates
 setWebhook
@@ -68,10 +68,13 @@ closeGeneralForumTopic
 reopenGeneralForumTopic
 hideGeneralForumTopic
 unhideGeneralForumTopic
+unpinAllGeneralForumTopicMessages
 answerCallbackQuery
 setMyCommands
 deleteMyCommands
 getMyCommands
+setMyName
+getMyName
 setMyDescription
 getMyDescription
 setMyShortDescription