Allow wildcards in black/whitelist

[theychx]

Hi. Thank you for making this extension, it's really useful.

I'm currently experimenting with various approaches to reduce procrastination when working on projects. I'd like to use the lockdown/whitelist-only functionality of your extension for this. Currently there is no way to specify all subdomains for a listed domain-name, which makes the extension less than ideal for many scenarios. F.ex. readthedocs have a whatever.redthedocs.io project domain format.

[encadyma]

Hi @theychx ! Thank you for using Chronos. I'll take a look at #2 and #3 later today and see if I can push out an update by early next week.