Ultradns analyzers added (#20)

* Ultradns analyzers added

* Update usage.md

docs/IntelOwl/usage.md

@@ -253,7 +253,9 @@ The following is the list of the available analyzers you can run out-of-the-box.
 - `HudsonRock`: [Hudson Rock](https://cavalier.hudsonrock.com/docs) provides its clients the ability to query a database of over 27,541,128 computers which were compromised through global info-stealer campaigns performed by threat actors.
 - `CyCat`: [CyCat](https://cycat.org/) or the CYbersecurity Resource CATalogue aims at mapping and documenting, in a single formalism and catalogue available cybersecurity tools, rules, playbooks, processes and controls.
 - `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).
+
 ##### Generic analyzers (email, phone number, etc.; anything really)
 
 Some analyzers require details other than just IP, URL, Domain, etc. We classified them as `generic` Analyzers. Since the type of field is not known, there is a format for strings to be followed.