Use ISO8601DateFormatter for Swift Evolution dates

[dempseyatgithub]

The Swift Evolution proposals.json file is moving to use full ISO 8601 date strings for review period start and end dates.

The default ISO8601DateFormatter will parse the updated date strings without additional configuration.

It appears the only dependency on the current format is the inputDateFormatter in SwiftEvolution.swift. Updating to use ISO8601DateFormatter should address the change.

static var inputDateFormatter = ISO8601DateFormatter()

[kiliankoe]

Hey James, thanks for the heads-up and issue! I'm super curious how you managed to stumble across this repo.

We'll get it fixed soon for our bot :)

[dempseyatgithub]

You're welcome.

I searched GitHub for repositories that fetch 'https://download.swift.org/swift-evolution/proposals.json'.

I'm a member of the Swift Website Workgroup and I'm in the process of working on some changes to the generated metadata.

[kiliankoe]

Ah, that's clever! And cheers for making the effort!