[README.md] Add build status bagde

2017-10-21 02:11:11 +07:00 · 2017-10-21 02:11:11 +07:00 · 5c0e5bc4df
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+[![Build Status](https://travis-ci.org/rg3/youtube-dl.svg?branch=master)](https://travis-ci.org/rg3/youtube-dl)
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 youtube-dl - download videos from youtube.com or other video platforms

 - [INSTALLATION](#installation)