Update pyusbtool

[phurley]

Update supporting these command line args:

usage: pyusbtool.py [-h] [-s] [-v] config [destination]

Download and verify software files from a JSON configuration.

positional arguments:
  config         Path to the JSON configuration file.
  destination    Destination directory for downloaded files (default: current directory).

options:
  -h, --help     show this help message and exit
  -s, --skip     Skip MD5 checksum validation for existing files.
  -v, --version  Show script version and exit.

Also added progress bar if tqdm is available, but does not require it to be installed (still requires requests)