Migrate to Swift4 all iOS cookbooks. https://github.com/aerogear/aerogear-ios-cookbook/

Pending cookbooks to update:
https://github.com/aerogear/aerogear-ios-cookbook/tree/master/Authentication
https://github.com/aerogear/aerogear-ios-cookbook/tree/master/Howdy
https://github.com/aerogear/aerogear-ios-cookbook/tree/master/Jedi
https://github.com/aerogear/aerogear-ios-cookbook/tree/master/SharedShoot
https://github.com/aerogear/aerogear-ios-cookbook/tree/master/Shoot
https://github.com/aerogear/aerogear-ios-cookbook/tree/master/Two-Factor