Remove Bot::StaleChat in favor of Bot::Forbidden

lib/telegram/bot.rb

@@ -6,26 +6,7 @@ module Telegram
   module Bot
     class Error < StandardError; end
     class NotFound < Error; end
-
-    # Error class for events when chat is not available anymore for bot.
-    # While Telegram has same error codes for different messages and there is no
-    # official docs for this error codes it uses `description` to
-    # check response.
-    class StaleChat < Error
-      DESCRIPTIONS = [
-        'Bot was blocked',
-        'bot was kicked',
-        "can't write to",
-        'group chat is deactivated',
-      ].freeze
-
-      class << self
-        def match_response?(response)
-          description = response['description'].to_s
-          DESCRIPTIONS.any? { |x| description[x] }
-        end
-      end
-    end
+    class Forbidden < Error; end
 
     autoload :Async,              'telegram/bot/async'
     autoload :Botan,              'telegram/bot/botan'