Quick question, when I push an app to CF I get this output at the bottom
after the app starts.

```
requested state: started
instances: 1/1
usage: 256M x 1 instances
urls: sinatra-test-dan.cfapps.io
last uploaded: Wed Mar 16 14:54:50 UTC 2016
stack: unknown
buildpack: https://github.com/cloudfoundry/ruby-buildpack#v1.6.5

state since cpu memory disk
details
#0 running 2016-03-16 10:55:12 AM 0.1% 21M of 256M 68.3M of 1G
```

Anyone know why the stack always reports "unknown"? If I run `cf app`
right after, it will report the stack properly. It only shows up this way
on the initial push.

Versions:
- cf version 6.16.1+924508c-2016-02-26
- cf v231
- diego 0.1454.0
- garden 0.333.0

Thanks,

Dan