print usage message if options are invalid.
authorJérôme Benoit <jerome.benoit@piment-noir.org>
Thu, 30 Nov 2017 20:27:30 +0000 (21:27 +0100)
committerJérôme Benoit <jerome.benoit@piment-noir.org>
Thu, 30 Nov 2017 20:27:30 +0000 (21:27 +0100)
Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>

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