irdata v0.6.3 - auth token persistence

You can now, optionally, persist the auth token the iRacing OAuth2 flow. iRacing rate limits running a full OAuth2 flow to 12 tries every hour.

What's Changed

• doc updates by @popmonkey in #10
• Persist auth token by @popmonkey in #11

Full Changelog: v0.6.2...v0.6.3