This bumps the minimum version required to build SwiftLint to 4.2. The primary motivating factor to drop support for Swift 4.0-4.1.x is that SwiftLint now uses CryptoSwift, which requires 4.2.
* Add changelog entry
* Remove --allow-warnings flag from CocoaPods commands
* Update CryptoSwift to 0.13.0
* Migrate to Swift 4.2
* Remove CircleCI tests for Swift < 4.2
* Update English and Chinese README
Korean README doesn't yet have a version table like this.
* Update gems
* Add changelog entry for fixed compiler warnings
* Update CocoaPods to 1.6.0.beta.2
To work around https://github.com/CocoaPods/CocoaPods/issues/7708
The MIT license doesn't require that all files be prepended with this
licensing or copyright information. Realm confirmed that they're ok with this
change. This will enable some companies to contribute to SwiftLint and the
date & authorship information will remain accessible via git source control.
JP Simard