Update CHANGELOG-5.2.md

Author: XWB

CHANGELOG-5.2.md

@@ -4,8 +4,9 @@ CHANGELOG for 5.2.x
 This changelog references the relevant changes (bug and security fixes) done
 in 5.2 versions.
 
-### 5.2.0 (xxxx-xx-xx)
+### 5.2.0 (2020-09-15)
 
+* Added Symfony 5 support.
 * Dropped Symfony 4.0, 4.1 and 4.2 support.
 * Fixed paginate subscriber when request stack is empty.
 * Fixed Doctrine deprecation notice in RegisterListenersService.