Take chat from message for callback queries

README.md

@@ -131,6 +131,7 @@ class Telegram::WebhookController < Telegram::Bot::UpdatesController
     # do_smth_with(data)
 
     # There are `chat` & `from` shortcut methods.
+    # For callback queries `chat` if taken from `message` when it's available.
     response = from ? "Hello #{from['username']}!" : 'Hi there!'
     # There is `respond_with` helper to set `chat_id` from received message:
     respond_with :message, text: response