Small issue with Swift Package Manager support

[Christian Gossain]

Hi there,

I'm trying to use this library with SPM (Swift Package Manager) but the Package.swift file contained at tag 0.9.0 is invalid. The one on the master branch however is valid.

Would you be able to tag the current master branch with a new version (e.g. 0.10.0)?

Simply tagging the latest commit would fix this issue.

Thanks!