minor #206 [Doc] Update UPGRADE file (lchrusciel)

This PR was merged into the 1.0-dev branch.

Discussion
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Commits
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1f1ccdb [Doc] Update UPGRADE file

UPGRADE.md

@@ -2,6 +2,24 @@
 
 1. `Sylius\RefundPlugin\Entity\RefundPaymentInterface` state constants values were changed to lowercase. Backward compatibility provided by migration.
 
+1. Adjust new templates from the plugin (ref. [PR #198](https://github.com/Sylius/RefundPlugin/pull/198)) 
+
+   > :warning: Check in your git repository, what has changed and only adjust templates where needed
+
+    ```bash
+    cp -R vendor/sylius/refund-plugin/src/Resources/views/SyliusAdminBundle/* templates/bundles/SyliusAdminBundle/
+    ```
+
+1. Copy new migrations
+
+    ```bash
+    cp -R vendor/sylius/refund-plugin/migrations/{Version20200306145439.php,Version20200306153205.php,Version20200310094633.php,Version20200310185620.php} src/Migrations
+    ```
+
+1. Change usage of `Sylius\RefundPlugin\Entity\SequenceInterface` to `Sylius\RefundPlugin\Entity\CreditMemoSequenceInterface`
+
+1. Change usage of `Sylius\RefundPlugin\Provider\CurrentDateTimeProviderInterface` to `Sylius\RefundPlugin\Provider\CurrentDateTimeImmutableProviderInterface`
+
 ### UPGRADE FROM 1.0.0-RC.1 TO 1.0.0-RC.2
 
 1. `Sylius\RefundPlugin\Entity\CreditMemoUnit` was changed to `Sylius\RefundPlugin\Entity\LineItem` which is a resource entity now.