updated readme
updated readme

jrendel/SwiftKeychainWrapper,jrendel/SwiftKeychainWrapper,tobiasoleary/SwiftKeychainWrapper,mozilla/SwiftKeychainWrapper,rnewman/SwiftKeychainWrapper,rnewman/SwiftKeychainWrapper,mozilla/SwiftKeychainWrapper,rnewman/SwiftKeychainWrapper,tobiasoleary/SwiftKeychainWrapper,mozilla/SwiftKeychainWrapper