Update README.md

Author: NoahDragon

README.md

@@ -1,4 +1,5 @@
 # hexo-html-minifier
+[![Build Status](https://travis-ci.org/hexojs/hexo-html-minifier.svg?branch=master)](https://travis-ci.org/hexojs/hexo-html-minifier)
 
 Minify HTML files with [HTMLMinifier].
 
@@ -19,4 +20,4 @@ html_minifier:
 
 See <https://github.com/kangax/html-minifier#options-quick-reference>
 
-[HTMLMinifier]: https://github.com/kangax/html-minifier
+[HTMLMinifier]: https://github.com/kangax/html-minifier