updated pod spec to point to dev tag
updated pod spec to point to dev tag

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