Support (edited_)channel_post updates, add api methods from 2.3, 2.3.1

lib/telegram/bot/updates_controller.rb

@@ -80,10 +80,12 @@ module Telegram
 
       PAYLOAD_TYPES = %w(
         message
+        edited_message
+        channel_post
+        edited_channel_post
         inline_query
         chosen_inline_result
         callback_query
-        edited_message
       ).freeze
       CMD_REGEX = %r{\A/([a-z\d_]{,31})(@(\S+))?(\s|$)}i
       CONFLICT_CMD_REGEX = Regexp.new("^(#{PAYLOAD_TYPES.join('|')}|\\d)")