* Mark Swift 5 as supported
* Only set a single Swift version on podspec
Multiple swift versions requires CocoaPods 1.7.0, which is still
in beta.
* Modernize ruby hash syntax
* Update SourceKitten to 0.23.1
must push one spec at a time, and if more than one exists,
must specify them by name.
Also include the 'LICENSE' file in the portable zip and let
SwiftLint.podspec know about it.