Merge pull request #5 from bavix/dev

add canBuy

Author: rez1dent3

src/Interfaces/Product.php

@@ -5,6 +5,11 @@
 interface Product extends Wallet
 {
 
+    /**
+     * @return bool
+     */
+    public function canBuy(): bool;
+
     /**
      * @return int
      */