list board revisions in pinout --help #1198

usage: pinout [-h] [--version] [-r REVISION] [-c] [-m] [-x]

A utility for querying GPIO pin-out information.

options:
  -h, --help            show this help message and exit
  --version             show program's version number and exit
  -r REVISION, --revision REVISION
                        Board revision. Default is to autodetect revision of current device
  -c, --color           Force colored output (by default, the output will include ANSI color codes if run in
                        a color-capable terminal). See also --monochrome
  -m, --monochrome      Force monochrome output. See also --color
  -x, --xyz             Open pinout.xyz in the default web browser

  -r REVISION, --revision REVISION
                        Board revision. Default is to autodetect revision of current device ; one of:
                        A,B,A+,B+,2B,CM,3B,Zero,CM3,Zero W,3B+,3A+,CM3+,4B,Zero2W,400,CM4,5B