work around command-line-args regression in 4.0.2/3
work around command-line-args regression in 4.0.2/3

Change command-line-args's version back to the pinned value 4.0.1 to work around a regression in 4.0.2/3 that causes tests to fail.
mykmelez/qbrt,mykmelez/qbrt,mykmelez/qbrt