Merge pull request #31 from AnshSinghal/Mullvad_DNS

Mullvad_DNS added in Usage docs of IntelOwl

Author: mlodic

docs/IntelOwl/usage.md

@@ -258,6 +258,7 @@ The following is the list of the available analyzers you can run out-of-the-box.
 - `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).
 - `IPQuery`: [IPQuery](https://ipquery.io/) aims to provide a straightforward and simplistic API for working with IP addresses.
+- `Mullvad_DNS`: [Mullvad_DNS](https://github.com/mullvad/dns-blocklists) is an analyzer that queries Mullvad's DNS-over-HTTPS service (using the "base" endpoint) to check a domain's DNS records. It supports two modes: `query`: returns raw DNS answer data. `malicious`: interprets an NXDOMAIN (rcode==3) as the domain being blocked (i.e., malicious).
 
 ##### Generic analyzers (email, phone number, etc.; anything really)