Update CHANGELOG.md

Author: drbyte

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to `laravel-permission` will be documented in this file
 
+## 2.38.0 - 2019-09-02
+- Allow support for multiple role/permission models
+- Load roles relationship only when missing
+- Wrap helpers in function_exists() check
+
 ## 2.37.0 - 2019-04-09
 - Added `permission:show` CLI command to display a table of roles/permissions
 - `removeRole` now returns the model, consistent with other methods