Fix enforcer rules

Preparing release v6.0.0-rc3

Preparing 6.0.0-rc2, which contains a bug fix for Spring

Updated release date before releasing, since the release notes are in…

…cluded in the CLI package

Release 6.0.0.beta-SNAPSHOT

Released 5.5.1

Released 5.5.0

Released 5.4.0

Released 5.3.0

Released 5.2.1