Remove deprecated massage

Author: PhamBaTho

Source/BTNavigationDropdownMenu.swift

@@ -197,11 +197,6 @@ public class BTNavigationDropdownMenu: UIView {
         fatalError("init(coder:) has not been implemented")
     }
 
-    @available(*, deprecated, message="Use init(navigationController:title:items:) instead", renamed="BTNavigationDropdownMenu(navigationController: UINavigationController?, title: String, items: [AnyObject])")
-    public convenience init(title: String, items: [AnyObject]) {
-        self.init(navigationController: nil, title: title, items: items)
-    }
-    
     public init(navigationController: UINavigationController? = nil, containerView: UIView = UIApplication.sharedApplication().keyWindow!, title: String, items: [AnyObject]) {
 
         // Navigation controller