Revert "go back to using exec, but print while things are running"

This reverts commit 5498953169158eb5343fa6bc7d8960f20d0181d9.
Revert "use childprocess.spawn so we can stream stdout and stderr"

This reverts commit 4202cdadbf1887a37a189803d38c1e8b30f3d056.
update package version