修复

• Validator: 修复异步校验结果无效bug
• Form: 修复两次校验bug
• Slide: 特殊情况下动态修改不能滚动bug https://github.com/didi/cube-ui/issues/539
• DatePicker: 默认 min 和 max 值为正确的月份
• IndexList: 特殊情况下报错

Fixes

• Validator: fix async validate error
• Form: fix twice validate
• Slide: fix cannot scroll in some special cases https://github.com/didi/cube-ui/issues/539
• DatePicker: fix min and max should be right month
• IndexList: fix cannot get scroll instance in some cases