Add a way to remove the cache

[sk-]

When you change the configuration and the reuslt is cached there's no way other than touching all the file to force a rerun.

Several options are possible:

• Add a flag to remove the cache
• If the configuration file changed then disable the cache
• Maybe the --force option could also disable the cache.

[jamesshannon]

Just happened to me. I was about to uninstall gitlint

[sjincho]

I'd like to use git lint from CI server, where the build agent has no permissions to modify files under home dir.

It would be great to have an option to disable cache completely.

[sk-]

@w4-sjcho This is another issue. I created #130 .