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Remove redundant comma in argparse HOWTO (#1141)

Reported by Sean Canavan on docs@p.o.
B
Berker Peksag committed
8526fb74edf5ac9ca175b7cdcb0d82bb8780d2cf
Parent: f7e62cf
Committed by GitHub <noreply@github.com> on 4/20/2017, 4:29:35 AM