Update InstanceIdentifier.php

src/Contracts/InstanceIdentifier.php

@@ -2,8 +2,6 @@
 
 namespace Gloudemans\Shoppingcart\Contracts;
 
-use Money\Money;
-
 interface InstanceIdentifier
 {
     /**
@@ -15,8 +13,6 @@ interface InstanceIdentifier
 
     /**
      * Get the unique identifier to load the Cart from.
-     *
-     * @return int|string
      */
     public function getInstanceGlobalDiscount(): float;
 }