Update for leanpub preview

manuscript/recipes/duplicity.md

@@ -160,7 +160,7 @@ Launch Duplicity stack by running ```docker stack deploy duplicity -c <path -to-
 
 Nothing will happen. Very boring. But when the cron script fires (daily), duplicity will do its thing, and backup everything in /var/data to your cloud destination.
 
-## Chef's Notes 📓
+## Chef's Notes 
 
 1. Automatic backup can still fail if nobody checks that it's running successfully. I'll be working on an upcoming recipe to monitor the elements of the stack, including the success/failure of duplicity jobs.
 2. The container provides the facility to specify an SMTP host and port, but not credentials, which makes it close to useless. As a result, I've left SMTP out of this recipe. To enable email notifications (if your SMTP server doesn't require auth), add ```SMTP_HOST```, ```SMTP_PORT```, ```EMAIL_FROM``` and ```EMAIL_TO``` variables to duplicity.env