0.0.2

The builds on compwa-org.rtfd.io and compwa.rtfd.io should not update as regularly anymore, since they simply redirect to compwa.github.io (see ComPWA/compwa.github.io#170). They are therefore now only built upon pushes to the stable branch. However, since the latest commit on stable, tag 0.0.1, is still using an old configuration file for Read the Docs, the build fails. We therefore need a new release as soon as possible.