Show only provided versions/sections

[andreasvirkus]

Hi there and thanks for a great Vue component/changelog generator : )

We'd love to use this to show the changed/newest versions of the changelog to a user.
Would it be possible to provide a semver from which upwards to show versions?
So if we'd provide 1.4.2, it'd show from there upwards (and maybe also exclude [Unreleased])