Update path to logo

Author: gallib

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-    <img width="80%" src="https://raw.githubusercontent.com/gallib/laravel-short-url/master/art/logo.png" alt="Laravel Short URL logo" />
+    <img width="80%" src="https://raw.githubusercontent.com/gallib/laravel-short-url/master/assets/images/logo.png" alt="Laravel Short URL logo" />
 </p>
 
 # Laravel Short Url [![Build Status](https://travis-ci.org/gallib/laravel-short-url.svg?branch=master)](https://travis-ci.org/gallib/laravel-short-url) [![StyleCI](https://styleci.io/repos/122629531/shield?branch=master)](https://styleci.io/repos/122629531)