message: fix snap bug
diff: @@ -263,7 +263,7 @@ export function snapMixin(BScroll) {
  BScroll.prototype._goToPage = function (x, y = 0, time, easing) {
  const snap = this.options.snap
  - if (!snap.loop || !this.pages || !this.pages.length) {
  + if (!snap || !this.pages || !this.pages.length) {
  return
  }
  @@ -305,7 +305,7 @@ export function snapMixin(BScroll) {
  BScroll.prototype.goToPage = function (x, y, time, easing) {
  const snap = this.options.snap
  - if (!snap.loop || !this.pages || !this.pages.length) {
  + if (!snap || !this.pages || !this.pages.length) {
  return
  }
  