Swift tools version 3.1.0 not supported

[khaneja]

Hey there—

I tried adding DateTools to my Xcode project, but I'm encountering an error:

package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 5.9' to specify the current tools version in https://github.com/MatthewYork/DateTools

Is there any way to resolve this? Appreciate any help!

[sphanley]

@MatthewYork, any chance this could be addressed? Should be a simple update needed to the Package.swift, which would get this working again. It would be very much appreciated, thanks for your work on this library!