Tweaked layout of README badges

They're now aligned left-to-right instead of above each other on GitHub.
(The rendered RST on PyPI and in the docs should be unaffected.)

Also changed their order.

README.rst

@@ -1,40 +1,42 @@
-django-simple-history
-=====================
+django-simple-history |pypi-version|
+====================================
 
-.. image:: https://github.com/jazzband/django-simple-history/actions/workflows/test.yml/badge.svg
+|jazzband| |build-status| |docs| |coverage| |maintainability| |code-style| |downloads|
+
+.. |pypi-version| image:: https://img.shields.io/pypi/v/django-simple-history.svg
+   :target: https://pypi.org/project/django-simple-history/
+   :alt: PyPI Version
+
+.. |jazzband| image:: https://jazzband.co/static/img/badge.svg
+   :target: https://jazzband.co/
+   :alt: Jazzband
+
+.. |build-status| image:: https://github.com/jazzband/django-simple-history/actions/workflows/test.yml/badge.svg
    :target: https://github.com/jazzband/django-simple-history/actions/workflows/test.yml
    :alt: Build Status
 
-.. image:: https://readthedocs.org/projects/django-simple-history/badge/?version=latest
+.. |docs| image:: https://readthedocs.org/projects/django-simple-history/badge/?version=latest
    :target: https://django-simple-history.readthedocs.io/en/latest/?badge=latest
    :alt: Documentation Status
 
-.. image:: https://img.shields.io/codecov/c/github/jazzband/django-simple-history/master.svg
+.. |coverage| image:: https://img.shields.io/codecov/c/github/jazzband/django-simple-history/master.svg
    :target: https://app.codecov.io/github/jazzband/django-simple-history?branch=master
    :alt: Test Coverage
 
-.. image:: https://img.shields.io/pypi/v/django-simple-history.svg
-   :target: https://pypi.org/project/django-simple-history/
-   :alt: PyPI Version
-
-.. image:: https://api.codeclimate.com/v1/badges/66cfd94e2db991f2d28a/maintainability
+.. |maintainability| image:: https://api.codeclimate.com/v1/badges/66cfd94e2db991f2d28a/maintainability
    :target: https://codeclimate.com/github/jazzband/django-simple-history/maintainability
    :alt: Maintainability
 
-.. image:: https://static.pepy.tech/badge/django-simple-history
-   :target: https://pepy.tech/project/django-simple-history
-   :alt: Downloads
-
-.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
+.. |code-style| image:: https://img.shields.io/badge/code%20style-black-000000.svg
    :target: https://github.com/psf/black
    :alt: Code Style
 
-.. image:: https://jazzband.co/static/img/badge.svg
-   :target: https://jazzband.co/
-   :alt: Jazzband
+.. |downloads| image:: https://static.pepy.tech/badge/django-simple-history
+   :target: https://pepy.tech/project/django-simple-history
+   :alt: Downloads
 
 
-django-simple-history stores Django model state on every create/update/delete.
+``django-simple-history`` stores Django model state on every create/update/delete.
 
 This app supports the following combinations of Django and Python:
 
@@ -51,7 +53,7 @@ Getting Help
 
 Documentation is available at https://django-simple-history.readthedocs.io/en/stable/
 
-Pull requests are welcome.  Read the `CONTRIBUTING`_ file for tips on
+Pull requests are welcome. Read the `CONTRIBUTING`_ file for tips on
 submitting a pull request.
 
 .. _CONTRIBUTING: https://github.com/jazzband/django-simple-history/blob/master/CONTRIBUTING.rst