nativeInputProps aren't passed to the underlying input in Upload component

[ocruze]

Hi, I tried to use the Upload component and the onChangewas never getting called. So I looked into the code and it seems that the nativeInputProps aren't passed to the underlying input. I tried a dirty fix and passed the nativeInputProps to the inner input and it worked. If you'd like I can provide a PR.

[garronej]

Thanks a lot for the report.
Yes please we'd appreciate a PR!