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qr: add page (#3769)

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* qr: add page

* Update qr.md
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Starbeamrainbowlabs 2020-01-20 20:58:38 +00:00 • committed by Zlatan Vasović
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commit 7916181b6e
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# qr
> Generate QR codes in the terminal with ANSI VT-100 escape codes.
> More information: <https://github.com/lincolnloop/python-qrcode/>.
- Generate a QR code:
`echo "{{data}}" | qr`
- Specify the error correction level (defaults to M):
`echo "{{data}}" | qr --error-correction={{L|M|Q|H}}`