Add blog links.
Merge pull request #41 from keithrbennett/add-blog-links

Add blog links.
Merge branch 'edns-client-subnet-again' of github.com:cedespeaux/dnsruby into edns-client-subnet-again
Replaced 1 and 2 with constants for IP address families.
Replace 8 with EDNS_SUBNET_OPTION.
Merge pull request #1 from keithrbennett/edns-client-subnet-again

Edns client subnet again