StaleChat error

README.md

@@ -89,6 +89,9 @@ bot.extend Telegram::Bot::Client::TypedResponse
 bot.get_me.class # => Telegram::Bot::Types::User
 ```
 
+Any API request error will raise `Telegram::Bot::Error` with description in its message.
+Special `Telegram::Bot::StaleChat` is raised when bot can't post messages to the chat anymore.
+
 ### Controller
 
 ```ruby