No option to hide upload button in v4.1

[xinfli]

An option "showUploadButton" was added to hide upload button for issue #883, but in v4.1.0 there is no such option.

So now is it possible to hide the upload button on rederWebChat()?

[vmunnuru]

Its possible with styling:

import { createStyleSet } from 'botframework-webchat';

const styleSet = createStyleSet({});

styleSet.uploadButton = { ...styleSet.uploadButton,
  display: 'none'
};
(while returning send property to the component as)
styleSet={styleSet}

(Edited by @compulim for code formatting)