Update usage.md with WAD (#21)

Author: basedBaba

docs/IntelOwl/usage.md

@@ -255,6 +255,7 @@ The following is the list of the available analyzers you can run out-of-the-box.
 - `Vulners`: [Vulners](vulners.com) is the most complete and the only fully correlated security intelligence database, which goes through constant updates and links 200+ data sources in a unified machine-readable format. It contains 8 mln+ entries, including CVEs, advisories, exploits, and IoCs — everything you need to stay abreast on the latest security threats.
 - `UltraDNS_DNS`: Retrieve current domain resolution with [UltraDNS](https://vercara.com/ultra-dns-public).
 - `UltraDNS_Malicious_Detector`: Scan if a DNS is marked malicious by [UltraDNS](https://vercara.com/ultra-dns-public).
+- `WAD`: [WAD](https://github.com/CERN-CERT/WAD) (Web Application Detector) lets you analyze given URL(s) and detect technologies used by web application behind that URL, from the OS and web server level, to the programming platform and frameworks, as well as server- and client-side applications, tools and libraries.
 
 ##### Generic analyzers (email, phone number, etc.; anything really)