title: How to upgrade a postgres database from 9.3 to 9.4 on heroku?
body: <p>This is a question for heroku staff.  I have a database running postgres 9.3.  When will heroku offer 9.4 that was released last week?  Is there an upgrade guide?  And is there a best practice way of converting json to jsonb columns with minimum downtime?  Thanks!</p>