namecheap url doc mention (#245)
namecheap url doc mention (#245)

* add initial URL support to namecheap provider

* add URL / FRAME records to namecheap provider

* add menion of URL types to namecheap docs

rbelnap/dnscontrol,rbelnap/dnscontrol,StackExchange/dnscontrol,StackExchange/dnscontrol,StackExchange/dnscontrol