Caishen

• Supports Swift version 4.2 and Xcode 10.0+

• Added the missing range of 622126-622925 to Discover card type.

• Fixed warnings about deprecated String.character usage
• Added new BINs for MasterCard (Reference)

Update for Xcode 9 and Swift 4 syntax.

• Fixes a crash when prefilling card information
• Fixes an issue where InterfaceBuilder would throw errors
• Provides same ability to subclass objects as on Swift 2.3 before
• Fixed an issue where prefilling card information would only fill card number