Use "shields.io" for CI badge.

Author: KelSolaar

README.rst

@@ -5,7 +5,7 @@ Colour - Checker Detection
 
 |actions| |coveralls| |codacy| |version|
 
-.. |actions| image:: https://github.com/colour-science/colour-checker-detection/workflows/Continuous%20Integration/badge.svg
+.. |actions| image:: https://img.shields.io/github/workflow/status/colour-science/colour-checker-detection/Continuous%20Integration?label=actions&logo=github&style=flat-square
     :target: https://github.com/colour-science/colour-checker-detection/actions
     :alt: Develop Build Status
 .. |coveralls| image:: http://img.shields.io/coveralls/colour-science/colour-checker-detection/develop.svg?style=flat-square