fix/accept sfc as component in themr typings

[raveclassic]

This fix allows themr decorator to accept React.SFC and is related to #39
Here are test cases:

type TFooProps = {
	foo: string
};

type TFooState = {
	bar: number
};

@themr('Symbol()') //ok
class FooClass extends React.Component<TFooProps, TFooState> {
	state = { //ok
		bar: 2123
	};

	render() {
		return <div>hi</div>;
	}
}

const Foo2 = themr('Symbol()')(FooClass); //ok

const FN: React.SFC<TFooProps> = props => (
	<div>hi</div>
);

const fn = themr(Symbol())(FN); //ok

[raveclassic]

this is solved in #47