RFE: Allow users to override the default URL format to accommodate different Git hosting services like Bitbucket

[netopsengineer]

Feature description:
The current implementation only links to lines using the Github style notation of #Lxx, while Bitbucket uses a more simple #xx, the feature should default to the current pattern, but allowed to be optionally passed in to override it for better support outside of Github.

Problem and motivation:
I am currently finding and replacing the pattern after the files are generated because I love the functionality of this library, so this would be a nice way to eliminate the need to hack the files up.