Vec2 normalize() return value

[wemyss]

I was wondering whether normalize should return a reference to this rather than the old length so that it makes it possible to use it in function chaining. Or alternatively create a normal() that is a wrapper around normalize and just returns this.

See the example below:

const myVec = vec.clone()
    .sub(vec2)
    .normalize()
    .mul(0.5)
    // and so on

Really cool project by the way! My only complaint is the minimal documentation which makes it harder as I don't have an understanding of where everything is in the library yet.