tick of 0s causes deadlock

[Alan Braithwaite]

[Alan Braithwaite]

Deadlock causes a panic. New implementation causes a panic. Seems like something could be handled more cleanly in the implementation.

[Amir Abushareb]

hmm, can you elaborate?

  phony (master) go run main.go --tick 0
phony: --tick must be a positive interval, got "0s"
exit status 1

[Alan Braithwaite]

Ah, I missed the other PR:

#13