Add Travis badge with build status.

Author: trekhleb

README.md

@@ -1,7 +1,6 @@
 # Homemade Machine Learning
 
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/trekhleb/homemade-machine-learning/master?filepath=notebooks)
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 [![Build Status](https://travis-ci.org/trekhleb/homemade-machine-learning.svg?branch=master)](https://travis-ci.org/trekhleb/homemade-machine-learning)
 
 _For Octave/MatLab version of this repository please check [machine-learning-octave](https://github.com/trekhleb/machine-learning-octave) project._