update example and usage info for -dp/--package flag#10

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agt24 wants to merge 6 commits intoNDAR:masterfrom agt24:master

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Commits on May 22, 2019

Update README.md
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Update downloadcmd.py
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Fix usage syntax for package optiion
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fix usage for --package arg
agt24
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fix usage message for --package flag
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Commits on Jul 12, 2019

Merge branch 'master' into master
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