[6.x] update changelog

Author: TBlindaruk

CHANGELOG-6.x.md

@@ -1,6 +1,12 @@
 # Release Notes for 6.x
 
-## [Unreleased](https://github.com/laravel/framework/compare/v6.20.14...6.x)
+## [Unreleased](https://github.com/laravel/framework/compare/v6.20.15...6.x)
+
+
+## [v6.20.15 (2021-01-26)](https://github.com/laravel/framework/compare/v6.20.14...v6.20.15)
+
+### Changed
+- Pipe new through render and report exception methods ([#36037](https://github.com/laravel/framework/pull/36037))
 
 
 ## [v6.20.14 (2021-01-21)](https://github.com/laravel/framework/compare/v6.20.13...v6.20.14)