'SFC' is deprecated

> @deprecated
as of recent React versions, function components can no longer be considered 'stateless'. Please use FunctionComponent instead.

deprecated example:
```tsx
export const GalleryImage: React.SFC<GalleryImageProps> = ({ clickHandler }) => {
    return (
        <div onClick={clickHandler}>
             lorem
        </div>
    );
};
```
`React.SFC` change to `React.FC`