OneOO

Updated to use the latest SwiftNIO. This implies that Swift 5.5.2+ is now required.

FiveFour

Late NIO versions now require Swift 5.4.

Asynchronously Not

Enforce use of Swift 5.5 enabled Macro. Changed Package.swift to 5.2 syntax (on a quest to be as WET as possible).

Removed support for Swift 5.0 and 5.1, because Apple:

We didn’t do it because it was required, instead that it felt appropriate