typo in Readme.md

[petrasl1976]

Hi,

I think you have typo in https://github.com/PowerDNS/pdns_recursor-ansible/blob/master/README.md:

pdns_res_config_lua should be pdns_rec_config_lua

Regards

[Bodenhaltung]

Hi,

yes, you are right, thanks!

If you want, feel free to submit a PR.

[SrX]

Addressed in #225.