Updated workflows/phpunit.yml

Author: Andrey Helldar

.github/workflows/phpunit.yml

@@ -9,7 +9,7 @@ jobs:
         strategy:
             fail-fast: true
             matrix:
-                laravel: [ 5.4, 5.5, 5.6, 5.7, 5.8, 6.0, 7.0, 8.0 ]
+                laravel: [ "5.4", "5.5", "5.6", "5.7", "5.8", "6.0", "7.0", "8.0" ]
 
         name: Laravel ${{ matrix.laravel }}