Merge pull request #39 from geraintp/master

add flexibility to inherit the models and define and update the model factories

src/Model/Customer.php

@@ -39,7 +39,7 @@ class Customer extends User
      *
      * @return CustomerFactory
      */
-    protected static function newFactory(): CustomerFactory
+    protected static function newFactory()
     {
         return CustomerFactory::new();
     }

src/Model/Item.php

@@ -91,7 +91,7 @@ class Item extends Model
      *
      * @return ItemFactory
      */
-    protected static function newFactory(): ItemFactory
+    protected static function newFactory()
     {
         return ItemFactory::new();
     }

src/Model/Order.php

@@ -76,7 +76,7 @@ class Order extends Post
      *
      * @return OrderFactory
      */
-    protected static function newFactory(): OrderFactory
+    protected static function newFactory()
     {
         return OrderFactory::new();
     }

src/Model/Product.php

@@ -105,7 +105,7 @@ protected static function boot()
      *
      * @return ProductFactory
      */
-    protected static function newFactory(): ProductFactory
+    protected static function newFactory()
     {
         return ProductFactory::new();
     }