Removed version on composer require

Author: Nyholm

README.md

@@ -20,15 +20,15 @@ Open a command console, enter your project directory and execute the
 following command to download the latest stable version of this bundle:
 
 ```bash
-$ composer require backup-manager/symfony "^1.0"
+$ composer require backup-manager/symfony
 ```
 
 This command requires you to have Composer installed globally, as explained
 in the [installation chapter](https://getcomposer.org/doc/00-intro.md)
 of the Composer documentation.
 
-Step 2: Enable the Bundle
--------------------------
+Step 2: Enable the Bundle (Symfony 2 & 3)
+-----------------------------------------
 
 Then, enable the bundle by adding it to the list of registered bundles
 in the `app/AppKernel.php` file of your project: