removes ruby versions 2.1, 2.2 & 2.3 (#61)
removes ruby versions 2.1, 2.2 & 2.3 (#61)

Both versions are no longer supported by current versions of bundler.
Both versions are also beyond their End-Of-Life for some time as is 2.3
Furthermore, we add support for ruby 2.6
webionate/pactas_itero