Added notes

Author: chrispat

README.md

@@ -37,4 +37,5 @@ https://render.com/docs/deploy-rails#update-your-app-for-render
 
 
 ## Heroku
-https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server
+https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server
+https://scottbartell.com/2020/01/22/automating-rails-database-migrations-on-heroku/