Accept any callable as argument for addSplitItem in CliMenuBuilder

Author: simonorono

src/Builder/CliMenuBuilder.php

@@ -315,7 +315,7 @@ private function processIndividualShortcut(MenuItemInterface $item, callable $ca
         }
     }
 
-    public function addSplitItem(\Closure $callback) : self
+    public function addSplitItem(callable $callback) : self
     {
         $builder = new SplitItemBuilder($this->menu);