Merge pull request #320 from peter279k/shorten_null_operator

Apply the shorten null coalescing operator

src/Ray.php

@@ -152,7 +152,7 @@ public function markdown(string $markdown): self
      */
     public function env(?array $onlyShowNames = null, ?string $filename = null): self
     {
-        $filename = $filename ?? app()->environmentFilePath();
+        $filename ??= app()->environmentFilePath();
 
         $payload = new EnvironmentPayload($onlyShowNames, $filename);