zsh: compdef for pytest
zsh: compdef for pytest

This is older already, but was never committed.

I've just updated it to handle the new `--[no-]foo` output for
`store_true` options (https://github.com/blueyed/pytest/pull/267).

blueyed/oh-my-zsh,blueyed/oh-my-zsh,blueyed/oh-my-zsh