Bump version to v13.8

CHANGES.rst

@@ -2,6 +2,31 @@
 Changelog
 =========
 
+Version 13.8
+============
+*Released 2021-11-08*
+
+This is the technical changelog for version 13.8. More elaborate release notes can be found in the news channel `@pythontelegrambotchannel <https://t.me/pythontelegrambotchannel>`_.
+
+**Major Changes:**
+
+- Full support for API 5.4 (`#2767`_)
+
+**Minor changes, CI improvements, Doc fixes and Type hinting:**
+
+- Create Issue Template Forms (`#2689`_)
+- Fix ``camelCase`` Functions in ``ExtBot`` (`#2659`_)
+- Fix Empty Captions not Being Passed by ``Bot.copy_message`` (`#2651`_)
+- Fix Setting Thumbs When Uploading A Single File (`#2583`_)
+- Fix Bug in ``BasePersistence.insert``/``replace_bot`` for Objects with ``__dict__`` not in ``__slots__`` (`#2603`_)
+
+.. _`#2767`: https://github.com/python-telegram-bot/python-telegram-bot/pull/2767
+.. _`#2689`: https://github.com/python-telegram-bot/python-telegram-bot/pull/2689
+.. _`#2659`: https://github.com/python-telegram-bot/python-telegram-bot/pull/2659
+.. _`#2651`: https://github.com/python-telegram-bot/python-telegram-bot/pull/2651
+.. _`#2583`: https://github.com/python-telegram-bot/python-telegram-bot/pull/2583
+.. _`#2603`: https://github.com/python-telegram-bot/python-telegram-bot/pull/2603
+
 Version 13.7
 ============
 *Released 2021-07-01*

docs/source/conf.py

@@ -60,9 +60,9 @@ author = u'Leandro Toledo'
 # built documents.
 #
 # The short X.Y version.
-version = '13.7'  # telegram.__version__[:3]
+version = '13.8'  # telegram.__version__[:3]
 # The full version, including alpha/beta/rc tags.
-release = '13.7'  # telegram.__version__
+release = '13.8'  # 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__ = '13.7'
+__version__ = '13.8'
 bot_api_version = constants.BOT_API_VERSION  # pylint: disable=C0103