Replace Travis badge with GitHub actions badge

Author: flashcode

.github/workflows/pythonpackage.yml .github/workflows/tests.yml.github/workflows/pythonpackage.yml renamed to .github/workflows/tests.yml

@@ -1,4 +1,4 @@
-name: Python package
+name: Tests
 
 on: [push]
 

README.adoc

@@ -3,7 +3,7 @@
 :email: flashcode@flashtux.org
 :lang: en
 
-image:https://travis-ci.org/flashcode/msgcheck.svg?branch=master["Build Status", link="https://travis-ci.org/flashcode/msgcheck"]
+image:https://github.com/flashcode/msgcheck/workflows/Tests/badge.svg["Tests", link="https://github.com/flashcode/msgcheck/actions"]
 
 `msgcheck` performs various checks on gettext files (with extension ".po"):