Add version '1.11.11' to p5Versions.js

We recently [released p5.js 1.11.11](https://github.com/processing/p5.js/releases/tag/v1.11.11)! This adds it to the version picker.

Changes:

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`

Author: ksen0

common/p5Versions.js

@@ -11,6 +11,7 @@ export const p5Versions = [
   '2.0.2',
   '2.0.1',
   '2.0.0',
+  '1.11.11',
   '1.11.10',
   '1.11.9',
   '1.11.8',