Update CHANGELOG

CHANGELOG.md

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 # Release Notes for 10.x
 
-## [Unreleased](https://github.com/laravel/framework/compare/v10.19.0...10.x)
+## [Unreleased](https://github.com/laravel/framework/compare/v10.20.0...10.x)
+
+## [v10.20.0](https://github.com/laravel/framework/compare/v10.19.0...v10.20.0) - 2023-08-22
+
+- [10.x] Allow default values when merging values into a resource by [@axlon](https://github.com/axlon) in https://github.com/laravel/framework/pull/48073
+- [10.x] Adds a `createOrFirst` method to Eloquent by [@tonysm](https://github.com/tonysm) in https://github.com/laravel/framework/pull/47973
+- [10.x] Allow utilising `withTrashed()`, `withoutTrashed()` and `onlyTrashed()` on `MorphTo` relationship even without `SoftDeletes` Model by [@crynobone](https://github.com/crynobone) in https://github.com/laravel/framework/pull/47880
+- [10.x] Mark Request JSON data to be InputBag in docblocks by [@jnoordsij](https://github.com/jnoordsij) in https://github.com/laravel/framework/pull/48085
+- [10.x] Markdown Mailables: Allow omitting Footer and Header when customising components by [@jorisnoo](https://github.com/jorisnoo) in https://github.com/laravel/framework/pull/48080
+- [10.x] Update EmailVerificationRequest return docblock by [@ahmedash95](https://github.com/ahmedash95) in https://github.com/laravel/framework/pull/48087
+- [10.x] Add commonly reusable Composer related commands from 1st party packages by [@crynobone](https://github.com/crynobone) in https://github.com/laravel/framework/pull/48096
+- [10.x] Add ability to measure a single callable and get result by [@timacdonald](https://github.com/timacdonald) in https://github.com/laravel/framework/pull/48077
+- [10.x] Fixes incorrect method visibility and add unit tests for `Illuminate\Support\Composer` by [@crynobone](https://github.com/crynobone) in https://github.com/laravel/framework/pull/48104
+- [10.x] Skip convert empty string to null test by [@hungthai1401](https://github.com/hungthai1401) in https://github.com/laravel/framework/pull/48105
+- [10.x] Using complete insert for mysqldump when appending migration dump to schema file by [@emulgeator](https://github.com/emulgeator) in https://github.com/laravel/framework/pull/48126
+- [10.x] Add `hasPackage` method to Composer class by [@emargareten](https://github.com/emargareten) in https://github.com/laravel/framework/pull/48124
+- [10.x] Add `assertJsonPathCanonicalizing` method by [@gdebrauwer](https://github.com/gdebrauwer) in https://github.com/laravel/framework/pull/48117
+- [10.x] Configurable storage path via environment variable by [@sl0wik](https://github.com/sl0wik) in https://github.com/laravel/framework/pull/48115
+- [10.x] Support providing subquery as value to `where` builder method by [@gdebrauwer](https://github.com/gdebrauwer) in https://github.com/laravel/framework/pull/48116
+- [10.x] Minor Tweaks by [@utsavsomaiya](https://github.com/utsavsomaiya) in https://github.com/laravel/framework/pull/48138
 
 ## [v10.19.0](https://github.com/laravel/framework/compare/v10.18.0...v10.19.0) - 2023-08-15