Code block with wrong character in chapter 0

[sidwellr]

In chapter 0, the code block shortly before example 0.2, the minus signs are entered as en-dashes. This doesn't affect the printed version (unless you look very carefully), but copying/pasting the code block from the web site doesn't work correctly. Please change the three en-dashes to minus signs.

  step() {

    let xstep = random(–1, 1);
    let ystep = random(–1, 1);

Any floating-point number from –1 to 1

    this.x += xstep;

    this.y += ystep;

  }