Fix README badge

Author: adamchainz

README.rst

@@ -3,19 +3,19 @@ Django-MySQL
 ============
 
 .. image:: https://img.shields.io/pypi/v/django-mysql.svg
-    :target: https://pypi.python.org/pypi/django-mysql
+   :target: https://pypi.python.org/pypi/django-mysql
 
-.. image:: https://github.com/adamchainz/django-mysql.svg?branch=master/actions?workflow=CI
-        :target: https://github.com/adamchainz/django-mysql/actions?workflow=CI
+.. image:: https://github.com/adamchainz/django-mysql/workflows/CI/badge.svg?branch=master
+   :target: https://github.com/adamchainz/django-mysql/actions?workflow=CI
 
 .. image:: https://coveralls.io/repos/adamchainz/django-mysql/badge.svg
-        :target: https://coveralls.io/r/adamchainz/django-mysql
+   :target: https://coveralls.io/r/adamchainz/django-mysql
 
 .. image:: https://readthedocs.org/projects/django-mysql/badge/?version=latest
-        :target: https://django-mysql.readthedocs.io/en/latest/
+   :target: https://django-mysql.readthedocs.io/en/latest/
 
 .. image:: https://img.shields.io/badge/code%20style-black-000000.svg
-    :target: https://github.com/python/black
+   :target: https://github.com/python/black
 
 .. figure:: https://raw.github.com/adamchainz/django-mysql/master/docs/images/dolphin-pony.png
    :alt: The dolphin-pony - proof that cute + cute = double cute.