README.md in telegram-bot-0.5.0 vs README.md in telegram-bot-0.6.0

- old
+ new

@@ -87,9 +87,12 @@
 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
 class Telegram::WebhookController < Telegram::Bot::UpdatesController
   # use callbacks like in any other controllers