Update README.md

Author: Corben Leo

README.md

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 # getallurls (gau)
 [![License](https://img.shields.io/badge/license-MIT-_red.svg)](https://opensource.org/licenses/MIT)
 
-getallurls (gau) fetches known URLs from AlienVault's [Open Threat Exchange](https://otx.alienvault.com), the Wayback Machine, and Common Crawl for any given domain. Inspired by Tomnomnom's [waybackurls](https://github.com/tomnomnom/waybackurls).
+getallurls (gau) fetches known URLs from AlienVault's [Open Threat Exchange](https://otx.alienvault.com), the Wayback Machine, Common Crawl, and URLScan for any given domain. Inspired by Tomnomnom's [waybackurls](https://github.com/tomnomnom/waybackurls).
 
 # Resources
 - [Usage](#usage)