Evaluate reckon plugin to infer version

[magicDGS]

In #48, we change our plugin to git versioning to com.palantir.git-version; nevertheless, this does not handle the tagging system, nor help with the release proces (thus, it requires some scripting). There is a plugin that could handle this: https://github.com/ajoberstar/reckon

We should explore that option and add it before we move forward to version 0.1.0

[magicDGS]

This should be added as the last step before v0.1.0 - it is really helpful to get the version number and tag releases in github.

[magicDGS]

See branch https://github.com/magicDGS/jsr203-http/tree/dgs_use_reckon_plugin