We recently [released p5.js 2.1.1](https://github.com/processing/p5.js/releases/tag/v2.1.1)! This adds it to the version picker.

(2.1.0 is intentionally omitted, we released a patch almost immediately.)

I have verified that this pull request:

* [x] has no linting errors (`npm run lint`)
* [x] has no test errors (`npm run test`)
* [x] is from a uniquely-named feature branch and is up to date with the  `develop` branch.
* [x] is descriptively named and links to an issue number, i.e. `Fixes #123`

To reflect updates in [p5.js-compatibility modules](https://github.com/processing/p5.js-compatibility), the paths have been updated

Add new p5 version 2.1.1 to p5Versions

Update p5.js compatibility URLs to version 0.2.0