Update README.md

Author: Jonathan DEKHTIAR

README.md

@@ -18,7 +18,7 @@
 [![PyPI - Python Version](http://ec2-35-178-47-120.eu-west-2.compute.amazonaws.com/pypi/pyversions/tensorlayer.svg)](https://pypi.org/project/tensorlayer/)
 [![Supported TF Version](http://ec2-35-178-47-120.eu-west-2.compute.amazonaws.com/badge/tensorflow-1.6.0+-blue.svg)](https://github.com/tensorflow/tensorflow/releases)
 
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+[![Build Status](http://ec2-35-178-47-120.eu-west-2.compute.amazonaws.com/travis/tensorlayer/tensorlayer/master.svg?label=Travis)](https://travis-ci.org/tensorlayer/tensorlayer)
 [![CircleCI](http://ec2-35-178-47-120.eu-west-2.compute.amazonaws.com/circleci/project/github/tensorlayer/tensorlayer/master.svg?label=Docker%20Build)](https://circleci.com/gh/tensorlayer/tensorlayer/tree/master)
 [![Documentation Status](http://ec2-35-178-47-120.eu-west-2.compute.amazonaws.com/readthedocs/tensorlayer/latest.svg?label=ReadTheDocs-EN)](https://tensorlayer.readthedocs.io/)
 [![Documentation Status](http://ec2-35-178-47-120.eu-west-2.compute.amazonaws.com/readthedocs/tensorlayercn/latest.svg?label=ReadTheDocs-CN)](https://tensorlayercn.readthedocs.io/)