Add -v option to see installed version of misp-modules

[chrisinmtown]

Please add a -v or --version option so it's easy to see the installed version of misp-modules. Thanks in advance for considering this.

$ bin/misp-modules --help --version
usage: misp-modules [-h] [-t] [-s] [-d] [-p P] [-l L] [-m M] [--devel]

misp-modules server

optional arguments:
  -h, --help  show this help message and exit
  -t          Test mode
  -s          Run a system install (package installed via pip)
  -d          Enable debugging
  -p P        misp-modules TCP port (default 6666)
  -l L        misp-modules listen address (default localhost)
  -m M        Register a custom module
  --devel     Start in development mode, enable debug, start only the module(s) listed in -m.
              Example: -m misp_modules.modules.expansion.bgpranking