For a mature program (not a library) I like using a combination year.counter. No semantic meaning at all apart from monotonous improvement, and you can tell how

For a mature program (not a library) I like using a combination year.counter. No semantic meaning at all apart from monotonous improvement, and you can tell how old a version is. 2017.75, 2018.76, 2018.77, 2019.78 etc