Add support for setting user timezone

Readme.md

@@ -30,6 +30,20 @@
 
 `docker run -p 5000:5000 -e DATABASE_URL=postgres://postgres:59fff56880e1bbb42e753d2a82ac21b6@peterstockings.com:15389/bloodpressure_db bloodpressure`
 
+# Model updates
+
+Create migration
+
+```
+flask db migrate -m "Add timezone to Profile model"
+```
+
+Apply migration
+
+```
+flask db upgrade
+```
+
 # Fix deployment issues
 
 Because I was originally using a Heroku buildpack to build/host this app prior to switching to a Dockerfile it sets the ports to: