Add functionality for historical data requests

[Big-Gray]

Currently pyairnow doesn't have functionality to make historical data requests. I'd like to add that.

[asymworks]

Sure, feel free to open a PR for it. I don't have any formal contributor guidelines at the moment, but please include tests, and try and keep coding somewhat consistent with what is in there.

[Big-Gray]

Quick question: When I was running make test, I kept getting an error "Makefile:18: *** recipe commences before first target. Stop.". It seems that export is a make keyword, and if I make the following change it seems to work:

export :
poetry export -f requirements.txt -o requirements-dev.txt --with dev

exportar :
poetry export -f requirements.txt -o requirements-dev.txt --with dev

Have you run into this problem before when working on it?

[asymworks]

I haven't seen that issue on my end, but maybe different versions of make are more permissive with that keyword. I'll update the Makefile target to be requirements instead of export so it doesn't cause that problem anymore.