P5.js: README.md forum link outdated

[stu01509]

Most appropriate sub-area of p5.js?

• [ ] Color
• [ ] Core/Environment/Rendering
• [ ] Data
• [ ] Events
• [ ] Image
• [ ] IO
• [ ] Math
• [ ] Typography
• [ ] Utilities
• [ ] WebGL
• [x] Other (specify if possible)

README.md forum link seems outdated,
Maybe change the link https://forum.processing.org/two/categories/p5-js to https://discourse.processing.org/c/p5js

If yes, I will create a new PR.

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[limzykenneth]

@stu01509 Go ahead with the change, I'll assign the issue to you. Thanks.