message: mark the onClick prop required on AccessibleButton
diff: @@ -39,7 +39,7 @@ interface IProps extends React.InputHTMLAttributes<Element> {
  tabIndex?: number;
  disabled?: boolean;
  className?: string;
  - onClick?(e?: ButtonEvent): void;
  + onClick(e?: ButtonEvent): void;
  }
  interface IAccessibleButtonProps extends React.InputHTMLAttributes<Element> {
  