Allow for descending date range.

[jaycarey]

Reasons for making this change

Change to make the yearsRange option support descending values.

If this is related to existing tickets, include links to them as well.

Checklist

• [x] I'm updating documentation
  • [x] I've checked the rendering of the Markdown text I've added
• [x] I'm adding or updating code
  • [ ] I've added and/or updated tests
  • [x] I've updated docs if needed
• [x] I'm adding a new feature
  • [ ] I've updated the playground with an example use of the feature