Merge pull request #429 from Iterable/bug/mob-2407-universal-link

[MOB-2407] - Fix initialization issue for deep links

Author: tapashmajumder

swift-sdk/IterableAPI.swift

@@ -129,7 +129,12 @@ public final class IterableAPI: NSObject {
     @objc(handleUniversalLink:)
     @discardableResult
     public static func handle(universalLink url: URL) -> Bool {
-        internalImplementation?.handleUniversalLink(url) ?? false
+        if let internalImplementation = internalImplementation {
+            return internalImplementation.handleUniversalLink(url)
+        } else {
+            IterableAPIInternal.pendingUniversalLink = url
+            return false
+        }
     }
 
     /// Add an entry in the device attributes