Add historical citation formats from Georgia and Oregon

[lmullen]

This pull request is a test pull request as discussed in this issue on the eyecite repository. This PR makes two changes adding some historical information:

• Kelly is added as an antique (nominative) reporter for the first five volumes of the Georgia Reports.
• The abbreviation Oreg., frequently used in historical legal documents, is added for Oregon.

Tests in the reporters-db repository pass locally after these changes. Informal tests of whether eyecite can pick up citations in these formats also work. Please let me know if there is a more explicit kind of test that needs to be added when making additions like this.

[CLAassistant]

All committers have signed the CLA.

[flooie]

When you say test PR do you mean draft?

[lmullen]

When you say test PR do you mean draft?

Sorry, I was unclear. This is a genuine PR, not a draft. But we anticipate having a lot more historical reporters to contribute. But as discussed here, we agree that it is best to send a small PR first to make sure we are contributing in the most helpful, correct way.

[mlissner]

Thanks @lmullen! Looks like the first of many. Can't wait for the rest. :)

[lmullen]

Thanks, @flooie, @mlissner. We'll try to send more in a sensible way.