feature Sylius#312 Improve dx with extending refund type (AdamKasp)

This PR was merged into the 1.0-dev branch.

Discussion
----------

Commits
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799c6d5 Remove finale from command and events

src/Command/GenerateCreditMemo.php

@@ -17,7 +17,7 @@
 use Sylius\RefundPlugin\Model\ShipmentRefund;
 use Webmozart\Assert\Assert;
 
-final class GenerateCreditMemo
+class GenerateCreditMemo
 {
     /** @var string */
     private $orderNumber;

src/Command/RefundUnits.php

@@ -17,7 +17,7 @@
 use Sylius\RefundPlugin\Model\ShipmentRefund;
 use Webmozart\Assert\Assert;
 
-final class RefundUnits
+class RefundUnits
 {
     /** @var string */
     private $orderNumber;

src/Command/SendCreditMemo.php

@@ -13,7 +13,7 @@
 
 namespace Sylius\RefundPlugin\Command;
 
-final class SendCreditMemo
+class SendCreditMemo
 {
     /** @var string */
     private $number;

src/Event/CreditMemoGenerated.php

@@ -13,7 +13,7 @@
 
 namespace Sylius\RefundPlugin\Event;
 
-final class CreditMemoGenerated
+class CreditMemoGenerated
 {
     /** @var string */
     private $number;

src/Event/RefundPaymentGenerated.php

@@ -13,7 +13,7 @@
 
 namespace Sylius\RefundPlugin\Event;
 
-final class RefundPaymentGenerated
+class RefundPaymentGenerated
 {
     /** @var int */
     private $id;

src/Event/ShipmentRefunded.php

@@ -13,7 +13,7 @@
 
 namespace Sylius\RefundPlugin\Event;
 
-final class ShipmentRefunded
+class ShipmentRefunded
 {
     /** @var string */
     private $orderNumber;

src/Event/UnitRefunded.php

@@ -13,7 +13,7 @@
 
 namespace Sylius\RefundPlugin\Event;
 
-final class UnitRefunded
+class UnitRefunded
 {
     /** @var string */
     private $orderNumber;

src/Event/UnitsRefunded.php

@@ -17,7 +17,7 @@
 use Sylius\RefundPlugin\Model\ShipmentRefund;
 use Webmozart\Assert\Assert;
 
-final class UnitsRefunded
+class UnitsRefunded
 {
     /** @var string */
     private $orderNumber;