Command-line options

[tplive]

• Need to make saving the comics opt-in, with path.
• Need an option to add date for downloading previous comics.
• Need an option to add webhook URL as a command-line option that overrides the environment variable.
• Change the default name of the webhook URL environment variable.
• Need an option to configure the name of the webhook URL environment variable.
• General command-line --help function

[tplive]

One option for each comic; xkcd, lunch, dunce and (soon to disappear) dilbert.