message: Update index.d.ts
  the range in createSnapGrid is a optional parameters
diff: @@ -300,7 +300,7 @@ declare namespace interact {
  supportsPointerEvent () : boolean
  stop ( event: any ) : InteractStatic
  pointerMoveTolerance ( tol?: number ) : number | InteractStatic
  - createSnapGrid ( grid: { x: number, y: number, range: number, offset?: Position, limits?: Rect } ) : SnapFunction
  + createSnapGrid ( grid: { x: number, y: number, range?: number, offset?: Position, limits?: Rect } ) : SnapFunction
  // TODO
  isSet ( any ) : any
  off ( any ) : any
  