Update phpunit.yml

Author: gofish543

.github/workflows/phpunit.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest]
-        php: [7.4]
+        php: [7.4, 8.0]
         laravel: [8.*, 7.*]
         dependency-version: [prefer-lowest, prefer-stable]
         include:
@@ -45,4 +45,4 @@ jobs:
         composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction --no-suggest
 
     - name: Execute test suite
-      run: ./vendor/bin/phpunit
+      run: ./vendor/bin/phpunit