2.0 can't be depended on with SwiftPM

[kiliankoe]

Hi, unfortunately SwiftPM is currently unable to depend on this package @ 2.0 due to the naming of the version numbers.

The previous ones are all prefixed with 'v', v0.5, v1.0, ... And then it's just '2.0'. Obviously this should be improved in SwiftPM, but it would be a quick and easy fix here until that happens 😊

[mohpor]

I guess there should be another release that includes the manifest, otherwise the only way to use the 2.0 version is to point at master instead of latest Version.