Fixed the link to the docs

Author: javiereguiluz

README.md

@@ -10,4 +10,4 @@ applications and requires using Symfony 3.4 or newer and [Symfony Flex][2].
 
 [1]: https://github.com/sensiolabs/SensioGeneratorBundle
 [2]: https://symfony.com/doc/current/setup/flex.html
-[3]: Resources/doc/index.rst
+[3]: src/Resources/doc/index.rst