MQE-2153: CHANGELOG.md updated for 3.0.0-RC4

Author: jilu1

CHANGELOG.md

@@ -1,5 +1,24 @@
 Magento Functional Testing Framework Changelog
 ================================================
+3.0.0 RC4
+---------
+
+### Enhancements
+
+* Customizability
+    * Changed `<group value="skip"/>` to no longer skip a test, instead test is added to `skip` group.
+* Maintainability
+    * Trimmed mftf.log to not include notices and warnings at test execution time.
+    * Added chrome option `--ignore-certificate-errors` in `functional.suite.dist.yml`.
+* Traceability
+    * Changed static check output directory from current working directory to `TESTS_BP/tests/_output/static-results/`.
+* Readability
+    * [3.0.0 Backward Incompatible Changes are documented.](./docs/backward-incompatible-changes.md)
+
+### Fixes
+
+* Fixed issue with Extended data entity won't merge array items.
+
 3.0.0 RC3
 ---------