message: fix(core.js): fix scroll stop bug
  when swiping distance less than momentumLimitDistance
diff: @@ -43,6 +43,7 @@ export function coreMixin(BScroll) {
  e.stopPropagation()
  }
  + this.startMoment = true
  this.moved = false
  this.distX = 0
  this.distY = 0
  @@ -101,7 +102,8 @@ export function coreMixin(BScroll) {
  let timestamp = getNow()
  // We need to move at least momentumLimitDistance pixels for the scrolling to initiate
  - if (timestamp - this.endTime > this.options.momentumLimitTime && (absDistY < this.options.momentumLimitDistance && absDistX < this.options.momentumLimitDistance)) {
  + if (timestamp - this.endTime > this.options.momentumLimitTime && this.startMoment && (absDistY < this.options.momentumLimitDistance && absDistX < this.options.momentumLimitDistance)) {
  + this.startMoment = false
  return
  }
  