Fix package definition
When XcodeGen used as a dependency in the project with same dependencies package definition became invalid. This PR fixes this issue.
Fixes #1490
@yonaskolb I'm using exactly Swift 5.9. I didn't think about backward compatibility.
Should I create a separate [email protected] ?
At this point I'm fine with dropping older versions, so no need for [email protected] Can you make that change here. I'll handle the release notes after merging
@yonaskolb I've bumped swift tools version in the package manifest
It looks like CI failed due API rate limit issue