Bump version to v13.9

CHANGES.rst

@@ -2,6 +2,23 @@
 Changelog
 =========
 
+Version 13.9
+============
+*Released 2021-12-11*
+
+This is the technical changelog for version 13.9. More elaborate release notes can be found in the news channel `@pythontelegrambotchannel <https://t.me/pythontelegrambotchannel>`_.
+
+**Major Changes:**
+
+- Full Support for Api 5.5 (`#2809`_)
+
+**Minor Changes**
+
+- Adjust Automated Locking of Inactive Issues (`#2775`_)
+
+.. _`#2809`: https://github.com/python-telegram-bot/python-telegram-bot/pull/2809
+.. _`#2775`: https://github.com/python-telegram-bot/python-telegram-bot/pull/2775
+
 Version 13.8.1
 ==============
 *Released 2021-11-08*

docs/source/conf.py

@@ -60,9 +60,9 @@ author = u'Leandro Toledo'
 # built documents.
 #
 # The short X.Y version.
-version = '13.8.1'  # telegram.__version__[:3]
+version = '13.9'  # telegram.__version__[:3]
 # The full version, including alpha/beta/rc tags.
-release = '13.8.1'  # telegram.__version__
+release = '13.9'  # telegram.__version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

telegram/version.py

@@ -20,5 +20,5 @@
 
 from telegram import constants
 
-__version__ = '13.8.1'
+__version__ = '13.9'
 bot_api_version = constants.BOT_API_VERSION  # pylint: disable=C0103