Update CHANGELOG.md

Author: tabacitu

CHANGELOG.md

@@ -8,6 +8,12 @@ All Notable changes to `Backpack CRUD` will be documented in this file.
 
 -----------
 
+## 4.0.52 - 2020-03-09
+
+### Fixed
+- #2529 fixes #2525 and #2523 - removed PUT route for the Create operation, which didn't serve any direct purpose but caused errors when running ```php artisan optimize``` for some, under Laravel 7;
+
+
 ## 4.0.51 - 2020-03-09
 
 ### Fixed