The 'responsive' prop on the Button component has no effect

[jcro21]

The Button component has the following prop:

/**
* If true, button scales to 100% width on small form factors.
*/
responsive: PropTypes.bool,

https://github.com/salesforce/design-system-react/blob/master/components/button/index.jsx#L177

This prop does not appear to have any effect when set to true (or false naturally).

This issue is demonstrated on the storybook example:
http://design-system-react-components.herokuapp.com/iframe.html?id=sldsbutton--doc-site-base-neutral&args=&viewMode=story

Looks like at some point the code conditionally adding the class was accidentally left out.

It should probably add the class slds-max-small-size--1-of-1 or some conditional variant of slds-button_stretch. In the past it was slds-max-small-button--stretch - this was removed in this commit a796c5b on 22 Jul 2016:
a796c5b#diff-1beac10e4cb18d36a1e2e3de7103d0f359da4b9b5748c851ce1c8061f1a803aeL143

[ashutosh887]

I would like to work on this Issue
Please assign to me and guide me once

[stale]

This issue has been automatically marked as stale, because it has not had recent activity. It will be closed if no further activity occurs. Maintainers are responsible for tech debt and project health. This is most likely a new components or component feature request. Please submit a pull request for or request feedback on this feature. Thank you.