Add reference

cves/2018/CVE-2018-0101.yaml

@@ -4,6 +4,7 @@ info:
   name: Cisco ASA Denial-of-Service # Leads to RCE
   author: dwisiswant0
   severity: critical
+  reference: https://www.exploit-db.com/exploits/43986
   description: |
     A vulnerability in the XML parser of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated,
     remote attacker to cause a reload of the affected system or to remotely execute code. It was also possible that