[10.x] Upgrade guide (#1345)

* Update README.md

* Update UPGRADE.md

Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: driesvints

UPGRADE.md

@@ -6,7 +6,23 @@ After updating Passport, you should always re-publish and re-compile the Vue "qu
 
     php artisan vendor:publish --tag=passport-views --force
 
-## Upgrading To 9.0 From 8.0
+## Upgrading To 10.0 From 9.x
+
+### Minimum PHP Version
+
+PHP 7.3 is now the minimum required version.
+
+### Minimum Laravel Version
+
+Laravel 8.0 is now the minimum required version.
+
+### Old Static Personal Client Methods Removed
+
+PR: https://github.com/laravel/passport/pull/1325
+
+The personal client configuration methods have been removed from the `Passport` class since they are no longer necessary. You should remove calls to these methods from your `AuthServiceProvider`.
+
+## Upgrading To 9.0 From 8.x
 
 ### Support For Multiple Guards
 
@@ -67,7 +83,7 @@ PR: https://github.com/laravel/passport/pull/1235
 The deprecated `revokeOtherTokens` and `pruneRevokedTokens` methods and the `revokeOtherTokens` and `pruneRevokedTokens` properties were removed from the `Passport` object.
 
 
-## Upgrading To 8.0 From 7.0
+## Upgrading To 8.0 From 7.x
 
 ### Minimum & Upgraded Versions