message: [bugfix] Step: incorrect active step when insert step  asynchronously
diff: @@ -5,7 +5,9 @@ const [sfc, bem] = use('step');
  export default sfc({
  beforeCreate() {
  - this.$parent.steps.push(this);
  + const { steps } = this.$parent;
  + const index = this.$parent.slots().indexOf(this.$vnode);
  + steps.splice(index === -1 ? steps.length : index, 0, this);
  },
  beforeDestroy() {
  