Missing Release cycle documentation

[kratkyzobak]

Issue description

There is approx one version minor version per year and few patches. Currently, it's approx 8 months from last release with 20 merged PRs, some of this being bugfixes (so patches)

I did not found any information, about release cycle of this project, so I want to ask, what is planned cycle of releasing at least patches and/or backporting bugfixes into older versions to patch them.

I think, some info in CONTRIBUTING.md would be nice, even if it is "Don't ask. We will release new version when we can."