Add Laravel 5.8 support

composer.json

@@ -17,7 +17,8 @@
         }
     ],
     "require": {
-        "php": "^7.1"
+        "php": "^7.1",
+        "illuminate/support": "~5.6.0|~5.7.0|~5.8.0"
     },
     "require-dev": {
         "orchestra/testbench": "^3.6",

tests/TestCase.php

@@ -9,7 +9,7 @@ use BeyondCode\Comments\CommentsServiceProvider;
 abstract class TestCase extends \Orchestra\Testbench\TestCase
 {
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
         $this->loadLaravelMigrations(['--database' => 'sqlite']);