Processing KEY constants are missing

[Tóth Ambrus]

P5JS's LEFT_ARROW, RIGHT_ARROW, etc. are missing from the types. The code does compile but it would be better, if we didn't have to look at the errors.

[Gareth Williams]

Thanks for pointing this out. Package updated to 0.9.0 which appears to have pulled in the key press constants as well as other things.

Reference here: https://p5js.org/reference/#/p5/keyPressed