Add GA scraper

[chriszs]

Adds a scaper for Georgia WARN Act data.

Steps to test

python -m warn.cli GA -l DEBUG

Should create exports/ga.csv

Closes #63

[palewire]

This looks great. Thank you for stepping up and taking on an important state!

One thing we're trying to be more consistent about is saving all of the raw files we gather into the cache, before any manipulation happens. Would you mind adding that to your submission?

Earlier this morning I added a simple example that I think will work for you to the docs.

[chriszs]

Okay. Now writes files to cache, reads prior years from cache.

[palewire]

Thanks for diving in on the cache, @chriszs! I've raised a few minor issues next. Let me know what you think about them.

I think we might be ready for @zstumgoren to weigh in.

[zstumgoren]

At a glance, this looks fantastic! Thanks for adding in the caching behavior @chriszs !!

Looks ready to merge if @palewire agrees. Somewhat related, but I'd like for us to hash out and formalize our caching policy in a new issue. I've been mulling some ideas about different caches approach in various situations, but some of the questions are more editorial judgement-y than technical. Wouldn't mind having us discuss as a group. 'll file a question Issue today and CC you both to get your thoughts. Meantime, thanks again @chriszs for shipping us GA!!

[palewire]

Agreed we need to settle a caching policy. Chris set a smart example here.

[palewire]

We're in. Thank you, @chriszs!