Update status badge for master branch

README.rst

@@ -5,9 +5,14 @@ Waitress
     :target: https://pypi.org/project/waitress/
     :alt: latest version of waitress on PyPI
 
-.. image:: https://travis-ci.org/Pylons/waitress.png?branch=master
-        :target: https://travis-ci.org/Pylons/waitress
-        :alt: Travis CI for waitress (master branch)
+.. image:: https://github.com/Pylons/waitress/workflows/Build/test%20on%20Linux/badge.svg?branch=master
+    :target: https://github.com/Pylons/waitress/actions?query=workflow%3A%22Build%2Ftest+on+Linux%22
+
+.. image:: https://github.com/Pylons/waitress/workflows/Build/test%20on%20MacOS/badge.svg?branch=master
+    :target: https://github.com/Pylons/waitress/actions?query=workflow%3A%22Build%2Ftest+on+MacOS%22
+
+.. image:: https://github.com/Pylons/waitress/workflows/Build/test%20on%20Windows/badge.svg?branch=master
+    :target: https://github.com/Pylons/waitress/actions?query=workflow%3A%22Build%2Ftest+on+Windows%22
 
 .. image:: https://readthedocs.org/projects/waitress/badge/?version=master
         :target: https://docs.pylonsproject.org/projects/waitress/en/master