React-Burger-Menu: Compatibility with older versions of React

Removing the state of ReactBurgerMenu isn't compatible with older versions of React. I know that this request is a bit regressive, but explicitly defining the state would be more practical for those of us who can't easily upgrade React.

types/react-burger-menu/index.d.ts

@@ -41,7 +41,7 @@ export interface Props {
     width?: number | string;
 }
 
-export class ReactBurgerMenu extends React.Component<Props> { }
+export class ReactBurgerMenu extends React.Component<Props, {}> { }
 
 export class slide extends ReactBurgerMenu { }
 export class stack extends ReactBurgerMenu { }