chore: Fix Travis-CI badge in readme.markdown

Author: Trott

readme.markdown

@@ -2,7 +2,7 @@
 
 watch mode for [browserify](https://github.com/substack/node-browserify) builds
 
-[![build status](https://secure.travis-ci.org/substack/watchify.svg?branch=master)](http://travis-ci.org/substack/watchify)
+[![build status](https://secure.travis-ci.org/browserify/watchify.svg?branch=master)](http://travis-ci.org/browserify/watchify)
 
 Update any source file and your browserify bundle will be recompiled on the
 spot.