Update P5 demo to use the latest version of P5

[bryanbraun]

We need to update the P5 demo to use the latest version of P5. Steps include:

• Download the latest version of the library, and place it in the examples/[library-name] folder. Minified files preferred, but non-minified works.
  • The filename should include the version number in it (for example: jquery-3.0.0.min.js).
• Update the demo to use the updated library, including any necessary code changes to the demo.
• Verify that the demo works across a sample of modern browsers (like Firefox, Chrome, Safari, and Edge).
  • Follow the instructions here to run a test version of the site locally.
• Commit your changes and submit a pull request.

[sarbikbetal]

@bryanbraun Can I work on this issue for Hacktoberfest?