Bump version to 4.2.2

KeychainAccess.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'KeychainAccess'
-  s.version          = '4.2.1'
+  s.version          = '4.2.2'
   s.summary          = 'KeychainAccess is a simple Swift wrapper for Keychain that works on iOS and OS X.'
   s.description      = <<-DESC
                          KeychainAccess is a simple Swift wrapper for Keychain that works on iOS and OS X.