Update preload error in 2.x

[ksen0]

When preload() is used in a 2.x sketch, a blocking FES error appears, and explains that this function cannot be used in the same way. Since release of 2.0, the p5.js-compatibility resources has been improved, and can be included in this message.

Proposed message:

🌸 p5.js says: The preload() function has been removed in p5.js 2.0. Please load assets in setup() using async / await keywords or callbacks instead. See https://github.com/processing/p5.js-compatibility for more information about 2.0 and compatibility, or https://dev.to/limzykenneth/asynchronous-p5js-20-458f for more information about promises and async/await.

Sketch: https://editor.p5js.org/ksen0/sketches/GWgLNlsgi

Previous message:

🌸 p5.js says: The preload() function has been removed in p5.js 2.0. Please load assets in setup() using async / await keywords or callbacks instead. See https://dev.to/limzykenneth/asynchronous-p5js-20-458f for more information