Ability to filter paths for commits

[6ixfalls]

There should be an option to have semantic-release target only specific commits, namely commits that follow a glob pattern or file path. This would be useful in monorepos, where there may be multiple separate packages that need releases. The commits from other packages are currently grouped and releases are created when unused.

I tried forking the commit analyzer repository but it doesn't seem like any part related to file paths is saved with the RawCommit type, so it didn't look simple to add.

[jaitaiwan]

Have you seen #190 ? This could probably be extended to support what you're looking for.