Examples and documentation should use `motion` instead of `openAnimation`

[multiwebinc]

The examples on the page http://react-component.github.io/menu/ and main documentation are outdated. The openAnimation property is no longer supported and produces the following warning:

Warning: Object type of openAnimation is removed. Please use motion instead.

I tried changing openAnimation to motion, but it doesn't appear to do anything.

[tabrez96]

Any updates on this? I referred rc-motion docs for implementation but it would be super helpful if we can get a demo using rc-motion