Update html-installation.md

Author: yajra

html-installation.md

@@ -4,9 +4,12 @@
 
 Run the following command in your project to get the latest version of the plugin:
 
-`composer require yajra/laravel-datatables-html:^9.0`
+```
+composer require yajra/laravel-datatables-html:^9.0
+```
 
 ## Configuration
+
 > This step is optional if you are using Laravel 5.5
 
 Open the file ```config/app.php``` and then add following service provider.