README.md in libmf-0.1.0 vs README.md in libmf-0.1.1

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 [LIBMF](https://github.com/cjlin1/libmf) - large-scale sparse matrix factorization - for Ruby
 
 :fire: Uses the C API for blazing performance
 
+[![Build Status](https://travis-ci.org/ankane/libmf.svg?branch=master)](https://travis-ci.org/ankane/libmf)
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 ## Installation
 
 Add this line to your application’s Gemfile:
 
 ```ruby