docs(readme): update repo badges

Author: mbdevpl

README.rst

@@ -15,22 +15,18 @@ Zero-overhead package versioning for Python.
     :target: https://pypi.org/project/version-query
     :alt: package version from PyPI
 
-.. image:: https://travis-ci.com/mbdevpl/version-query.svg?branch=master
-    :target: https://travis-ci.com/mbdevpl/version-query
-    :alt: build status from Travis CI
+.. image:: https://github.com/mbdevpl/version-query/actions/workflows/python.yml/badge.svg?branch=main
+    :target: https://github.com/mbdevpl/version-query/actions
+    :alt: build status from GitHub
 
-.. image:: https://ci.appveyor.com/api/projects/status/github/mbdevpl/version-query?branch=master&svg=true
-    :target: https://ci.appveyor.com/project/mbdevpl/version-query
-    :alt: build status from AppVeyor
+.. image:: https://codecov.io/gh/mbdevpl/version-query/branch/master/graph/badge.svg
+    :target: https://codecov.io/gh/mbdevpl/version-query
+    :alt: test coverage from Codecov
 
 .. image:: https://api.codacy.com/project/badge/Grade/437ab82bd6324530847fe8ed833f8d78
     :target: https://www.codacy.com/app/mbdevpl/version-query
     :alt: grade from Codacy
 
-.. image:: https://codecov.io/gh/mbdevpl/version-query/branch/master/graph/badge.svg
-    :target: https://codecov.io/gh/mbdevpl/version-query
-    :alt: test coverage from Codecov
-
 .. image:: https://img.shields.io/github/license/mbdevpl/version-query.svg
     :target: NOTICE
     :alt: license