No floating-point-constants in polyline coordinates possible
From what I understood from https://www.w3.org/TR/SVG11/shapes.html#PointsBNF, the coordinates for polylines and polygons may consist of floating point numbers.

I wonder why svgo uses `[]int` instead of `[]float` in `func (svg *SVG) Polyline(x []int, y []int, s ...string)`.
