add travis badge in readme

Author: yausername

README.md

@@ -1,2 +1,7 @@
 # youtubedl-lazy
 Lazy extractors based build of youtube-dl
+
+[![Build Status](https://travis-ci.org/yausername/youtubedl-lazy.svg?branch=master)](https://travis-ci.org/yausername/youtubedl-lazy)
+
+This repo runs a travis job daily to build lazy extractor version of [youtube-dl](https://github.com/rg3/youtube-dl)'s latest release.  
+[releases](https://github.com/yausername/youtubedl-lazy/releases)