Update readme badges

Author: mbucchi

README.md

@@ -1,7 +1,6 @@
 # pybalu
 
-[![Build Status](https://travis-ci.com/mbucchi/pybalu.svg?branch=master)](https://travis-ci.com/mbucchi/pybalu)
-[![Build status](https://ci.appveyor.com/api/projects/status/f010n1dwwyf5f2rk/branch/master?svg=true)](https://ci.appveyor.com/project/mbucchi/pybalu/branch/master)
+![Build and upload to PyPI](https://github.com/mbucchi/pybalu/workflows/Build%20and%20upload%20to%20PyPI/badge.svg)
 
 Python implementation for Balu, a computer vision, pattern recognition and image processing library. Originally implemented in matlab by Domingo Mery.