upgrading optparse to argparse

[simar7]

Hi there,

Stumbled upon this repo while trying to do something similar. I see you guys are using optparse currently. Would you like a PR submitted that updates this to argparse? optparse has been deprecated in favor of argparse.

lmk if you're interested, I can submit a PR!

[mjmj]

Sure, I'd gladly merge that in and thanks! Also, we've greatly simplified and improved the inital script and will be posting that soon.