Generate QR code with Slack command.
setup heroku app
$ heroku create appname
$ heroku addons:add heroku-postgresql
$ heroku config:set VERIFICATION_TOKEN=<slack app Verification Token>
$ heroku config:set BASE_URL=<heroku app url>
setup slack app
Command: /qrcoder
Request URL: <heroku app url>/command
/qrcoder text or url
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