Use placement in Dropdown.Button will cause error

[L-x-C]

Version

2.8.3

Environment

OSX, Chrome 57

Reproduction link

http://codepen.io/superlxc/pen/VpqoNr?editors=0011

Steps to reproduce

just click the demo

What is expected?

no error

What is actually happening?

Unknown prop placement on

tag. Remove this prop from the element. For details, see https://fb.me/react-unknown-prop

[L-x-C]

@afc163 2.9.0 still won't work, no error in console, but still won't work.

https://ant.design/components/dropdown-cn/#components-dropdown-demo-dropdown-button
In this demo, it adds placement="bottomLeft",

but in DOM, it's ant-dropdown-placement-bottomRight

[lock]

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