Turtle goto() should draw if pen down

[dkessner]

Hi Nick, thank you for your great work on this project, and for publishing it.

In standard Python turtle graphics, the goto() function will draw if the pen is down, something like this:

def goto(self, x, y):
    if self._pen_is_down:
        self._p5.line(self._x, self._y, x, y)
    self._x = x
    self._y = y
    self._render()

[nickmcintyre]

Thanks for the bug report @dkessner! I believe goto() and its aliases now work correctly as do setx() and sety().

The updated package is now on PyPI. Please let me know if you encounter other unexpected behavior.