DNSIMPLE: do not support DS records (#1608)
DNSIMPLE: do not support DS records (#1608)

DNSimple does not support adding your own DS records at this time.

Co-authored-by: Tom Limoncelli <99731c54e56da7667c48f35af95dff25592e8fcf@stackoverflow.com>
StackExchange/dnscontrol,StackExchange/dnscontrol,StackExchange/dnscontrol