[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/v6.20.29...6.x)
+## [Unreleased](https://github.com/laravel/framework/compare/v6.20.30...6.x)
+
+
+## [v6.20.30 (2021-07-02)](https://github.com/laravel/framework/compare/v6.20.29...v6.20.30)
+
+### Fixed
+- Fix edge case causing a BadMethodCallExceptions to be thrown when using loadMissing() ([#37871](https://github.com/laravel/framework/pull/37871))
 
 
 ## [v6.20.29 (2021-06-22)](https://github.com/laravel/framework/compare/v6.20.28...v6.20.29)