Update and rename phpunit.yml to laravel-6-7.yml

Author: Andrey Helldar

.github/workflows/phpunit.yml renamed to .github/workflows/laravel-6-7.yml

@@ -1,4 +1,4 @@
-name: phpunit
+name: "Laravel 6-7"
 on: [ push ]
 
 jobs:
@@ -9,7 +9,7 @@ jobs:
             fail-fast: true
             matrix:
                 php: [ "7.3", "7.4", "8.0" ]
-                laravel: [ "6.0", "7.0", "8.0" ]
+                laravel: [ "6.0", "7.0" ]
 
         name: PHP ${{ matrix.php }}, Laravel ${{ matrix.laravel }}