hg flow, merge release `r0.2.1` to publish branch `default`
Merge branch 'release/r0.3.0'
Merge branch 'release/r0.5.0'
Merge branch 'release/r0.8.0'
Merge branch 'release/r0.9.0'
Update to next SNAPSHOT version
Added Spring Boot as parent
Clean lab11 starter
lab12