Merge pull request #751 from Iterable/evan/remove-last=push-payload-setter

removes last push payload setter

Author: evantk91

swift-sdk/IterableAPI.swift

@@ -36,11 +36,7 @@ import UIKit
 
     /// The `userInfo` dictionary which came with last push
     public static var lastPushPayload: [AnyHashable: Any]? {
-        get {
-            implementation?.lastPushPayload
-        } set {
-            implementation?.lastPushPayload = newValue
-        }
+        implementation?.lastPushPayload
     }
 
     /// Attribution info (`campaignId`, `messageId`, etc.) for last push open or app link click from an email