Remove old testing badge

Author: rpep

README.md

@@ -2,7 +2,6 @@
 
 
 [![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/computationalmodelling/fidimag/master)
-[![Build Status](https://travis-ci.org/computationalmodelling/fidimag.svg?branch=master)](https://travis-ci.org/computationalmodelling/fidimag)
 [![Documentation Status](https://readthedocs.org/projects/fidimag/badge/?version=latest)](http://fidimag.readthedocs.org/en/latest/?badge=latest)
 [![codecov](https://codecov.io/gh/computationalmodelling/fidimag/branch/master/graph/badge.svg)](https://codecov.io/gh/computationalmodelling/fidimag)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.167858.svg)](https://doi.org/10.5281/zenodo.167858)