Add changelog entry for the caption arg

Author: pietroalbini

docs/changelog/0.5.rst

@@ -23,3 +23,12 @@ New features
 * Added ability to override default i18n messages
 
   * New attribute :py:attr:`botogram.Bot.override_i18n`
+
+* Added support for captions in audios, files and voices
+
+  * New argument ``caption`` in :py:meth:`botogram.Chat.send_audio`
+  * New argument ``caption`` in :py:meth:`botogram.Chat.send_file`
+  * New argument ``caption`` in :py:meth:`botogram.Chat.send_voice`
+  * New argument ``caption`` in :py:meth:`botogram.User.send_audio`
+  * New argument ``caption`` in :py:meth:`botogram.User.send_file`
+  * New argument ``caption`` in :py:meth:`botogram.User.send_voice`