README: very small white space fix

Author: Lars Janssen

README.md

@@ -22,7 +22,7 @@ For the install guide and reference, see:
 
 See also:
 
-* [All Symfony CMF documentation](http://symfony.com/doc/master/cmf/index.html)- complete Symfony CMF reference
+* [All Symfony CMF documentation](http://symfony.com/doc/master/cmf/index.html) - complete Symfony CMF reference
 * [Symfony CMF Website](http://cmf.symfony.com/) - introduction, live demo, support and community links