Update to Swift 4.2

[CodaFi]

What's in this pull request?

• Require Swift 4.2 to build the project
• Update to the 4.2 package format
• Remove deprecated constructs

[CodaFi]

Breaks my heart to see pods break my build again

https://github.com/CocoaPods/CocoaPods/issues/7708

Disabling pods support until 1.6.0 is released to the public.

[CodaFi]

⛵️