Use HTTPS for Symfony document link

Author: Arman-Hosseini

README.md

@@ -20,5 +20,5 @@ feel. It aims to solve the most common Webpack use cases.
 
 ## Documentation
 
-[Read the Documentation on symfony.com](http://symfony.com/doc/current/frontend.html)
+[Read the Documentation on symfony.com](https://symfony.com/doc/current/frontend.html)
 or view a demo application: [symfony/demo](https://github.com/symfony/demo).