Eslint-plugin-jsx-a11y: fieldset should allow role="radiogroup"

[wjmao88]

I've encountered an error trying to put radiogroup as a role on a fieldset

but according to MDN, radiogroup is a permitted role on fieldset https://developer.mozilla.org/en-US/docs/Web/HTML/Element/fieldset

[hallzac2]

I created https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/pull/746 to address this 😄