Update learn.json

Author: Lorenagubaira

learn.json

@@ -6,6 +6,7 @@
     "repository": "https://github.com/breatheco-de/python-flask-api-tutorial",
     "preview": "https://github.com/breatheco-de/python-flask-api-tutorial/blob/master/.learn/assets/preview.png?raw=true",
     "duration": 6,
+    "template_url": "self",
     "grading": "incremental",
     "difficulty": "beginner",
     "videoSolutions": false,