Upgrade guide

UPGRADE-5.0.md

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+# UPGRADE FROM 4.x to 5.0
+
+## FeedContentProviderInterface is replaced with FeedProviderInterface
+
+In version 4.x `StreamController` expects a `FeedContentProviderInterface` to provide the feed. Now it takes a `FeedProviderInterface` which is slightly different because it takes a `Request` as a parameter and no longer an array.
+
+Before :
+
+```php
+public function getFeedContent(array $options) : FeedInterface
+
+```
+
+Now :
+
+```php
+public function getFeed(Request $request): FeedInterface
+
+```
+
+## DoctrineFeedContentProvider is removed
+
+As its implementation is too narrow to let developers do what they need, it's better to simply remove it.
+
+### That's it
+
+There are no other modifications to upgrade into 5.0.