Merge pull request #5 from ulrichmathes/patch-1

[BUGFIX] fix type error for configurationFile param

src/Classes/Service/ConfigurationService.php

@@ -14,7 +14,7 @@ public function getFinalConfiguration($configurationPreset, $configurationFile):
         $configurationParts = [
             $this->getPresetConfiguration('default'),
             ($configurationPreset !== false) ? $this->getPresetConfiguration($configurationPreset) : [],
-            ($configurationFile !== false)
+            (is_string($configurationFile))
                 ? $this->getCustomConfiguration($configurationFile)
                 : $this->getCustomConfiguration('.fclint.json', true)
         ];