Specify that the color parameter isn't optional
If you do not use the `color` parameter on the Sketch component, it doesn't work correctly. The color changes but the draggable circle amongst other things do not update in position.

I feel as though you should specify this in the documentation if this _is_ the intended functionality.

See my [CodeSandbox](https://codesandbox.io/s/p702086pzq) for an example, I have remove `color={this.state.color}` from the component - add it to make it fully functional again.