remove $ so cut-and-paste works

I use the little gitclip widget to install bundles, but it leaves the $ on now.  This fixes that.

Author: tacman

README.md

@@ -11,8 +11,8 @@ Installation
 EasyAdmin 4 requires PHP 8.0.2 or higher and Symfony 5.4 or higher. Run the
 following command to install it in your application:
 
-```
-$ composer require easycorp/easyadmin-bundle
+```bash
+composer require easycorp/easyadmin-bundle
 ```
 
 Documentation