Update CHANGELOG.md

Author: soyuka

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## v2.0.0-rc.4
+
+* Breaking change in the `ItemDataproviderInterface`, `fetchData` is now in the context parameterer. `getItemFromIri` is now context aware [7f82fd7](https://github.com/api-platform/core/commit/7f82fd7f96bbb855599de275ffe940c63156fc5d)
+* Constants for event's priorities [2e7b73e](https://github.com/api-platform/core/commit/2e7b73e19ccbeeb8387fa7c4f2282984d4326c1f)
+* Properties mapping with XML/YAML is now possible [ef5d037](https://github.com/api-platform/core/commit/ef5d03741523e35bcecc48decbb92cd7b310a779)
+* Ability to configure and match exceptions with an HTTP status code [e9c1863](https://github.com/api-platform/core/commit/e9c1863164394607f262d975e0f00d51a2ac5a72)
+* Various fixes and improvements (SwaggerUI, filters, stricter property metadata) 
+
 ## 2.0.0
 
 * Full refactoring