chore: update docs for better attribution

spence · Feb 12, 2017 · 76c351b · 76c351b
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 # ValidUrl [![Build Status](https://travis-ci.org/spence/valid_url.svg?branch=master)](https://travis-ci.org/spence/valid_url)
 
-Validate a URL.
+Provides the best known regex for validating and extracting URLs.
+
+It builds on amazing work done by [Diego Perini](https://gist.github.com/dperini/729294)
+and [Mathias Bynens](https://mathiasbynens.be/demo/url-regex).
 
 ## Installation