heroku ps should display the release version for each dyno

[jkakar]

heroku ps currently shows output like this:

$ heroku ps -a st-kpi-http-gateway
=== web (Private-L): bin/s3env run bin/cedar kpi-http-gateway-api (4)
web.1: up 2017/11/16 21:10:50 -0800 (~ 16s ago)
web.2: up 2017/11/16 21:02:26 -0800 (~ 8m ago)
web.3: up 2017/11/16 21:03:14 -0800 (~ 7m ago)
web.4: up 2017/11/16 21:03:59 -0800 (~ 7m ago)

It's not obvious from this output that web.1 is running a different release than the other dynos. In this particular case, the app is in a Private Space, and so it'll be a few minutes before all the dynos are on the same release. This can be a bit surprising. I know I could use heroku ps:wait or pass --extended to wait for all the dynos to cycle or see the release version for each one, respectively, but both of those things are non-default behaviour that can be hard to discover or to remember to use.

It'd be nice to show the release in the output of heroku ps:

$ heroku ps -a st-kpi-http-gateway
=== web (Private-L): bin/s3env run bin/cedar kpi-http-gateway-api (4)
web.1: up v1117 2017/11/16 21:10:50 -0800 (~ 16s ago)
web.2: up v1116 2017/11/16 21:02:26 -0800 (~ 8m ago)
web.3: up v1116 2017/11/16 21:03:14 -0800 (~ 7m ago)
web.4: up v1116 2017/11/16 21:03:59 -0800 (~ 7m ago)