Accessibility improvements

It seems like the aria-hidden attribute cannot be overwritten. It would be great if consumers could either overwrite aria-hidden to undefined or if this component would be updated with some accessibility improvements.

Code example

Example taken from: https://www.w3.org/WAI/GL/wiki/Using_the_WAI-ARIA_aria-expanded_state_to_mark_expandable_and_collapsible_regions

<p class="button">
    <button id="button1" class="buttonControl" aria-controls="t1" aria-expanded="false"><span>Show</span> Topic 1</button>
</p>

<div id="t1" class="topic" role="region" tabindex="-1" >
    Topic 1 is all about being Topic 1 and may or may not have anything to do with other topics.
</div>

Additional context If you’d like a pull request, I can open one with either approach:

1. Allow aria-hidden to be overwritten.
2. Remove aria-hidden and add aria-expanded and aria-controls attributes.

Consumers should probably be able to control role and tabIndex but the accessibility attributes seem to make sense here given the simplicity and intended use of the component.

Thanks!

[tylertadej]

Awesome. Thank you for the quick implementation!

[Stanko]

Published in 2.0.23 🎉 https://github.com/Stanko/react-animate-height/commit/d6e10162805da90cc1a0fde3163f7309cb822600

Let me know if anything else should be added.