headerClass in Panel doesn`t work correctly

[JeremiahGeronimo]

When I pass headerClass to a panel component I get the headerClass class because it is not passed correctly to the classNames function https://github.com/react-component/collapse/blob/master/src/Panel.tsx#L69

[lagroms]

I have the same issue

[yoyo837]

https://github.com/react-component/collapse/releases/tag/v3.7.1