Proposal: Support monorepos

[clintonpowell]

It looks as if git-changelog-lib supports a pathFilters setting which would allow monorepos to filter commits by subdirectory. Currently, the plugin is getting all conventional commits from every project in the repo, which makes the plugin unusable.

Can you expose the pathFilters setting in both the changelog and semantic versioning tasks? I can currently get around the issue in the changelog task, as I can provide a settings file that sets the pathFilters property. The settingsFile configuration is not available for the semantic versioning task, however.