Next branch, vue2 is not supported, can I change the readme?

[zwf193071]

next分支，不支持vue2，可以更改一下readme吗？我看readme上写着支持vue2

但实际上，我的项目基于vue2.X，引入ant-design-vue@2.1.2，却报错

因vue2中不存在vue3的那些方法

Originally posted by @zwf193071 in #3343 (comment)

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