Ignore URLs in commit message line lengths

[domcleal]

Prevents warning on a commit message such as:

Rails source where relative controller is assumed by url_for if no named
route was given (the :use_route option):
https://github.com/rails/rails/blob/v4.2.6/actionpack/lib/action_dispatch/routing/route_set.rb#L695-L698

I think this is quite reasonable and better than using a URL shortener as it's a permanent URL that avoids a dependency on both a shortener service and even GitHub - it's quite usable if you even had a copy of the Rails release or repo with the data in the URL.

(theforeman/foreman#3564 (comment))

[dLobatog]

LGTM - I've had this problem too and it doesn't make much sense. Can't merge though (no rights)

[ehelms]

Thanks @domcleal !