Update README.rst

Fix badge layout for new GH renderer.

README.rst

@@ -1,21 +1,22 @@
+|status| |health| |coverage| |version| |chat|
 
-.. image:: https://github.com/peterbrittain/asciimatics/actions/workflows/test.yml/badge.svg
+.. |status| image:: https://github.com/peterbrittain/asciimatics/actions/workflows/test.yml/badge.svg
     :target: https://github.com/peterbrittain/asciimatics/actions/workflows/test.yml
     :alt: Build status
 
-.. image:: https://app.codacy.com/project/badge/Grade/c1fed1f2dc6a47a1bbe91f8851456beb
+.. |health| image:: https://app.codacy.com/project/badge/Grade/c1fed1f2dc6a47a1bbe91f8851456beb
    :target: https://app.codacy.com/gh/peterbrittain/asciimatics/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade
    :alt: Code Health
 
-.. image:: https://codecov.io/gh/peterbrittain/asciimatics/graph/badge.svg?token=UlVFVeLagX
+.. |coverage| image:: https://codecov.io/gh/peterbrittain/asciimatics/graph/badge.svg?token=UlVFVeLagX
     :target: https://codecov.io/gh/peterbrittain/asciimatics
     :alt: Code Coverage
 
-.. image:: https://img.shields.io/pypi/v/asciimatics.svg
+.. |version| image:: https://img.shields.io/pypi/v/asciimatics.svg
     :target: https://pypi.python.org/pypi/asciimatics
     :alt: Latest stable version
 
-.. image:: https://badges.gitter.im/asciimatics/Lobby.svg
+.. |chat| image:: https://badges.gitter.im/asciimatics/Lobby.svg
    :alt: Join the chat at https://gitter.im/asciimatics/Lobby
    :target: https://gitter.im/asciimatics/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge