[Enhancement] Max width parameter about asciichart

[vjpr]

Workaround

Quick and dirty. Take the kth point of n / width.

asciichart.plot([sampleData(a.data, width)])

function sampleData(oldArr, width) {
  const factor = Math.round(oldArr.length / width)
  return oldArr.filter(function (value, index, Arr) {
    return index % factor == 0
  })
}