0.5.2
* Add -v flag to executable

0.5.0
* Drop depdendency on MissingH

0.4.4

* Add `env` option to config.
* Inject `ANGEL_PROCESS_NUMBER` environment variable into processes started
  with `count`.

0.4.3

* Fix install failure from pidfile module not being accounted for.

0.4.2

* Add `pidfile` option to program spec to specify a pidfile location.

0.4.1

* Add `count` option to program spec to launch multiple instances of a program.