Update CHANGELOG-5.1.md

Author: XWB

CHANGELOG-5.1.md

@@ -7,3 +7,14 @@ in 5.1 versions.
 ### 5.1.0 (2019-xx-xx)
 
 * Added compatibility with Symfony 4.2.
+* Added autowiring support for `Elastica\Client`.
+* Added Pagerfanta 2.0 support.
+* Added optional routing in `ObjectPersister::deleteById`.
+* Added refresh options for persisters.
+* Added index name to `TransformEvent` document.
+* Added many unit tests.
+* Handle multiline strings in `ElasticaLogger`.
+* Fixed pagination of ORM queries when populating.
+* Profile panel redesign.
+* Updated documentation files.
+* Dropped PHP 5.6 support.