Update presentations to use the abstract block

source/_presentations/modern-drupal-development-with-composer.md

@@ -16,8 +16,10 @@ events:
     date: 2016-11-09
 ---
 
+{% block abstract %}
 Building a Drupal application? You no longer need to download archives to add new modules or update core, or deal with Drupal specific tools to manage your codebase.
 
 With Drupal "getting off the island" there has been an increase in the adoption of common PHP tools within the Drupal ecosystem.
 
 In this lightning talk, I’ll show how to build a Drupal application using Composer for dependency management.
+{% endblock %}