Need tests of turtledemo.colordemo on Windows installations

[Frank Millman]

On 2020-09-14 3:18 AM, Terry Reedy wrote:
> User Tushar Sadhwani and I both have Win 10 with 3.8.5 installed.  When 
> he runs
> ...> py -3.8 -m turtledemo.colormixer
> and moves the sliders a reasonable amount, he repeatably gets
> Fatal Python error: Cannot recover from stack overflow.
> ...
> https://bugs.python.org/issue41758
> 
> I have no problem, regardless of version, PowerShell or Command Prompt, 
> installation or repository build.  I suspect that the issue is specific 
> to his machine, but before closing, we need more evidence either way.
> 

I am running 3.8.2 on Windows 10, and I can run the test with no issues 
at all.

I will upgrade to 3.8.5 later today and try again.

Frank Millman