Adopt semver for versioning

[albfan]

https://semver.org/

It will help to update bugfixes, or try new implementations without break anything:

In a nutshell, X.Y.Z:

• X: Major version: Big changes that modify deps or behaviour
• Y: Minor version: Additions of functionality
• Z: Patch version: Fixes into existing functionality

[albfan]

ack