Create fix version if it doesn't exist

[danepowell]

If you attempt to create an issue with a non-existent fix version, you'll get a 400 error. This is somewhat unexpected, since you can create fix versions coincident with issues via the UI.

I could open a PR to call project/{projectIdOrKey}/versions prior to creating an issue to check if the fix version exists, though that doesn't seem like the best solution since it's an extra network request when it seems like Jira could handle this internally.