message: Add 'string' type  to union of container types for AutoScrollOption
  autoScroll can already use css selectors to find appropriate container element, but TypeScript doesn't know about it and throws a compilation error. This fixes that.
diff: @@ -27,7 +27,7 @@ declare module '@interactjs/core/options' {
  }
  export interface AutoScrollOptions {
  - container?: Window | HTMLElement
  + container?: Window | HTMLElement | string;
  margin?: number
  distance?: number
  interval?: number
  