Update CHANGELOG.md

Author: soyuka

CHANGELOG.md

@@ -14,6 +14,11 @@
 * Remove the event system in favor of the builtin Symfony kernel's events
 * Use the ADR pattern
 * Fix a ton of issues
+* `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)
 
 ## 1.1.1