Adding completion flags to meta yaml

Author: sra405

en/meta.yml

@@ -19,13 +19,15 @@ version: 4.1
 last_tested: 2018-08-02
 steps:
 - title: Introduction
-  completion: engaged
 - title: Build a Flask website
 - title: Add a new page
+  completion:
+  - engaged
 - title: Using HTML
 - title: 'Challenge: Add a HTML template to your 2nd page'
   challenge: true
 - title: Add colour with CSS
-  completion: internal
 - title: Adding dynamic content
+  completion:
+  - internal
 - title: What next?