Two minor improvements - quiet variable and using stderr
#80
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Quiet Variable
The quiet variable, in particular, is important when being used as a library. Users might not want to see so much content. The 2FA OTP is the one thing that always needs to be shown. By default, I left the verbosity as-is, and just added a command-line flag to turn it off.
stderr
Right now, most regular output is going to stdout. Status updates intended for the user should go to stderr rather than stdout. stdout should be for actual data that was returned by an intended command, not these status update messages.