Release version 4.2.1

I'll look into signing releases later

Update version in plugin.yml

Update version to 3.7.0 for release

Update version to 4.0.2 for release

Update version to 4.0.1 for release

Update version to 4.0.0 for release

Update version to 3.6.5 for release

Stable release of 1.5.0

Stable release of 1.4.0