Add L10 support, remove L6 and L8 support (#11)

* Add L10 support

* Update PHP version in ci.yml

* Update ci.yml

* Revert ci.yml changes

* Migrate PHPUnit XML config using "--migrate-configuration"

* Update phpunit.xml (delete cacheDirectory, use backupStaticAttributes instead of backupStaticProperties)

* Delete backupStaticAttributes

* Add PHP version matrix

* Use ci.yml from #12

* Correct Laravel matrix versions

* Revert ci.yml changes

* Use multiple PHP versions

* Update ci.yml

* Don't use PHP 8 with Laravel 10 in CI

* Update ci.yml

* Remove L6 and L8 support

* Use single PHP version in CI

* Update ci.yml

* Change matrix in ci.yml

* swap laravel 9 & 10

* Update README.md

---------

Co-authored-by: Samuel Štancl <samuel@archte.ch>

.github/workflows/ci.yml

@@ -3,13 +3,16 @@ name: run-tests
 on: [push, pull_request]
 
 jobs:
-  test:
+  tests:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: true
       matrix:
-        laravel: [6, 8, 9]
-
+        include:
+        - laravel: 9
+          php: 8.0
+        - laravel: 10
+          php: 8.1
 
     name: Tests (PHPUnit) - L${{ matrix.laravel }}
 
@@ -20,7 +23,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.0'
+          php-version: ${{matrix.php}}
 
       - name: Install dependencies
         run: composer require "laravel/framework:^${{matrix.laravel}}.0"