Update installation.md (#62)

Fix copy/paste on terminal

Resources/doc/installation.md

@@ -6,7 +6,7 @@ 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 sulu/automation-bundle
+composer require sulu/automation-bundle
 ```
 
 This command requires you to have Composer installed globally, as explained in