Stable development

This is devepoled to replace bump2version in my usecase, and it is almost completed at version 0.7.0.
(There are less fetures than bump2version, but I did not use it)

After some works are done, I will release as v1.0.0(stable) and will down priority from my OSS developments.
(This is not mean to set public-archive and to stop development. I am using this and be having will of keeping development)