chore: release 0.12.0

[github-actions[bot]]

:robot: I have created a release *beep* *boop*

0.12.0 (2021-12-23)

Features

• add varlociraptor test case generation (#429) (3ec7975)

Bug Fixes

• update the mutations columns in the overview table formatter (#423) (3af43b9)

This PR was generated with Release Please. See documentation.

[github-actions[bot]]

:robot: Release is at https://github.com/IKIM-Essen/uncovar/releases/tag/v0.12.0 :sunflower: