datePicker 添加默认渲染slot支持功能在1.3.13版本中无效

[Sun79]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.3.13

Environment

windows 10 x64, chrome 75.0.3770.142 x64, vue 2.5.22

Reproduction link

Steps to reproduce

使用的是官方示例中的模板，但是无法正确生效。

What is expected?

datePicker 添加默认渲染slot功能可以正常使用。

What is actually happening?

datePicker 添加默认渲染slot支持功能在新版本中无效。

[tangjinzhou]

升级 vue 到 2.6+ 或者 使用 slot-scope

[github-actions]

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