Update django.md: Fix link to fig.yml reference

docs/django.md

@@ -38,7 +38,7 @@ Simple enough. Finally, this is all tied together with a file called `fig.yml`.
       links:
         - db
 
-See the [`fig.yml` reference]() for more information on how it works.
+See the [`fig.yml` reference](http://orchardup.github.io/fig/yml.html) for more information on how it works.
 
 We can now start a Django project using `fig run`: