[Feature] add options.include; [Bugfix] fix options.exclude

[tyler-dot-earth]

Didn't find that options.exclude worked (perhaps similar to this comment). I also actually wanted options.include.

Results:

• include seems to work how i'd expect
• exclude seems to work how i'd expect

Room for improvement

• testing include + exclude at same time
• probably not the most well-integrated filtering code (i.e. maybe it'd be better off somewhere else in the code).

Open to any feedback / advice! 🎓 🍎

I'm using this in one of my own projects and it seems to be working fine now. I'll see if I can't polish it up some more in the next few days.

[tyler-dot-earth]

Closing because I figured out how to get exclude working properly (here: #148 (comment))