Another test fix for Laravel 5.4

Author: stevebauman

tests/SettingTest.php

@@ -159,7 +159,7 @@ public function test_cache()
         // Retrieve the value once to cache it.
         setting()->get('key');
 
-        setting()->model()->whereKey('key')->delete();
+        setting()->model()->where(['key' => 'key'])->delete();
 
         // Test that the value is cached when the model doesn't exist.
         $this->assertEquals('value', setting()->get('key'));