CAA support in AnyEvent::DNS

[Steve Atkins]

I found I needed support for CAA records[1] in AnyEvent::DNS.

Attached is a tiny patch to add support for them. It works for me, at least as far as
being able to resolve them for google.com.

(Licensed under the same terms as AnyEvent.)

Cheers,
  Steve

[1] http://tools.wordtothewise.com/rfc/6844

-------------- next part --------------
A non-text attachment was scrubbed...
Name: caa.patch
Type: application/octet-stream
Size: 542 bytes
Desc: not available
URL: <http://lists.schmorp.de/pipermail/anyevent/attachments/20170815/7843ea1f/attachment.obj>