make installation section more prominent

README.mdown

@@ -17,11 +17,18 @@ make sure you can always use another compatible logger at a later time.
 As of 1.11.0 Monolog public APIs will also accept PSR-3 log levels.
 Internally Monolog still uses its own level scheme since it predates PSR-3.
 
+Installation
+------------
+
+Install the latest version with
+
+```bash
+$ composer require monolog/monolog
+```
+
 Usage
 -----
 
-Install the latest version with `composer require monolog/monolog`
-
 ```php
 <?php