Upgrading App to Swift 4 and iOS 11 - TwitterKit Issues

I'm trying to upgrade my app to latest iOS support. I've added TwitterKit via CocoaPods, and placed header in my Bridge Header. However; I am getting an error saying:

Use of unresolved identified 'Twitter' - did you mean 'TWTRTTwitter'.

func application(_ application: UIApplication, didFinishLaunchingWithOptions lauunchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    Twitter.sharedInstance().start(withConsumerKey:"MYKEY", consumerSecret:"MYSECRET")
    return true
}

This right out of the Twitter recommended code. I also get it at:

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {

    let handled:Bool = true

    Twitter.sharedInstance().application(app, open: url, options: options)

    return handled
}

Any pointers?

Thank you, Andy Piper, I fixed the issue as following:

1. Updated pod so that TwitterCore 3.1.0 and TwitterKit 3.3.0

2. In Bridging-Header.h file

imported as TwitterKit/TWTRKit.h instead of TwitterKit/TwitterKit.h

3. In didFinishLaunchingWithOptions,

   • Modified Twitter.sharedInstance().start(withConsumerKey: ”your consumer key”, consumerSecret:”your consumer secret”)

TWTRTwitter.sharedInstance().start(withConsumerKey: ”your consumer key”, consumerSecret:”your consumer secret”)

i.e replace Twiter with TWTRTwitter where it is used.

• No need to initialize with fabric, so removed this line or removed

Fabric.with([Twitter.self]) or Fabric.with([TWTRTwitter.self])