Merge pull request #3 from dagophil/feature/add-github-ci-status-to-readme

Readme: Replaced travis ci status with github ci status.

Author: dagophil

README.md

@@ -1,6 +1,6 @@
 # *dmath*
 
-[![Travis CI Status](https://travis-ci.org/dagophil/dmath.svg?branch=master)](https://travis-ci.org/dagophil/dmath)
+![CI Status](https://github.com/dagophil/dmath/actions/workflows/python-package.yml/badge.svg)
 
 ## What is *dmath*?