Update README.md to add ClouDNS support
Update README.md to add ClouDNS support

Latest version of Lexicon (v2.1.11) provides ClouDNS API support. The proposed change for README.md reflects that.

Regards,
Adrien Ferrand
AnalogJ/lexicon,AnalogJ/lexicon,tnwhitwell/lexicon,tnwhitwell/lexicon