Swift 5 and New Collaborators

[Esqarrouth]

Hey guys

Quite a few people have asked for an upgrade to swift 5.

@Khalian and I have been out of the swift scene since swift 3 and mostly kept up with maintenance work on the project.

However the swift 5 upgrade is much, much harder than the swift 4 one since its no longer backwards compatible.

Is there anyone who could take over, make this project Swift 5 compatible? We need a few reviewers as well.

@lfarah @thellimist @piv199 @Yu-w @furuyan @inket @Daniel-Lopez @vilapuigvila @bcylin
@ceeyang @495929699

#509
#507
#504
#503
#501
#505

[piv199]

I actually stopped using this library quite a while ago... But I could review the latest pull requests to make it work with the latest Swift version.

[Esqarrouth]

If you're still up to date on latest Swift features, please do