Update for dynDNS plugin - Cloudflare

[skyjam]

Hi there

I have worked on the Cloudflare plugin:
Now it supports setting of TTL (seems to be broken in current plugin, since Cloudflare has set this to mandatory, see issue #1668) and it supports the use of an API token.

I don't have a GitHub account. Maybe someone can check my work and merge it?

See attached file

Thanks!

[skyjam]

OK, I have managed to create a pull request...