self._x and self._y are unused

[bablokb]

The parameters x and y to the constructor are saved to self._x and self._y, but these variables are never used. Do I miss something here?
(x and y themselves are passed to the super-class).

[makermelissa]

Are you referring to the sparkline? Yeah it might be able to be removed from there. Want to test that it still works after removing and submit a PR?

[bablokb]

Yes, this is within the sparkline-constructor. I will remove those lines.

[tekktrik]

Closed via #56