[8.x] Added reason phrase getter to Response class (laravel#39972)

* Added reason phrase getter to Response class

* Update Response.php

Co-authored-by: Taylor Otwell <taylor@laravel.com>

src/Illuminate/Http/Client/Response.php

@@ -120,6 +120,16 @@ public function status()
         return (int) $this->response->getStatusCode();
     }
 
+    /**
+     * Get the reason phrase of the response.
+     *
+     * @return string
+     */
+    public function reason()
+    {
+        return $this->response->getReasonPhrase();
+    }
+
     /**
      * Get the effective URI of the response.
      *