Fixed a reference in the README

Author: javiereguiluz

README.md

@@ -3,5 +3,5 @@ SymfonyMakerBundle
 
 Symfony Maker helps you creating empty commands, controllers, form classes,
 tests and more so you can forget about the required boilerplate code. This
-bundle replaces [SensioGeneratorBundle][https://github.com/sensiolabs/SensioGeneratorBundle]
+bundle replaces [SensioGeneratorBundle](https://github.com/sensiolabs/SensioGeneratorBundle)
 in modern Symfony applications.