Release v1.4.0

This mostly optimizes filicide so shutdown is faster, and cleans up the code. It also fixes a minor bug triggered by killing the main child process when it's already been reported as exited.

Release v1.3.0

Fix bugs that could lead to pid leakage - you should upgrade

Release v1.2.0

Remove annoying "killing [pid]" message

Release v1.1.0

Speeds up supervise startup (from 25 ms to ~1 ms on my system) by not running full fillicide on startup. (which was done to validate that it can be done)

Release v1.0.0

I've been using this in production for a few months now without any bugs, so it's just about ready for v1.0.0.