[maven-release-plugin] prepare release thymeleaf-spring3-2.0.21
[maven-release-plugin] prepare for next development iteration
Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit b707565d5a7ba228bfca5c576c137454638895fe.
Revert "[maven-release-plugin] prepare release thymeleaf-spring3-2.0.21"

This reverts commit d486854c6ef1b433db8812aa525661da479f5447.
Merge branch '2.0-dev' of github.com:thymeleaf/thymeleaf-spring into 2.0-master