Change a-input-search v-model's output to String

[kajeagentspi]

请严格按照如下模板反馈bug，尤其是复现bug的demo链接，不合规范的issue会被立刻关闭！！！

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

Reproduction link

example

Steps to reproduce

add an a-input-search with a v-model

What is expected?

v-model value would be string

What is actually happening?

v-model's value is an object containing the event

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[tangjinzhou]

please update to 0.6.4
https://github.com/vueComponent/ant-design/releases/tag/0.6.4

[lock]

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