doc: update README

Author: saghul

README.rst

@@ -9,13 +9,7 @@ pycares: Python interface for c-ares
 .. image:: https://badge.fury.io/py/pycares.png
     :target: http://badge.fury.io/py/pycares
 
-.. image:: https://secure.travis-ci.org/saghul/pycares.png?branch=master
-    :target: http://travis-ci.org/saghul/pycares
-
-.. image:: https://ci.appveyor.com/api/projects/status/vx1wbkfq3l7nm1m8?svg=true
-    :target: https://ci.appveyor.com/project/saghul/pycares
-
-.. image:: https://github.com/saghul/pycares/workflows/Test%20macOS/badge.svg
+.. image:: https://github.com/saghul/pycares/workflows/Test/badge.svg
     :target: https://github.com/saghul/pycares/actions)
 
 pycares is a Python module which provides an interface to c-ares.