Rounding issue in sector.py

[robby-wang]

There's rounding issue in sector.py, around line 210.
When there's only one item in the sector, it might have a rounding error.

When I added this code in the if statement:
print(self.start, self.end, x)
I got:
0 0.23938634812405565 0.23938634812405568

I was able to quickly fix it by changing it to:
if not self.start <= x <= (self.end+0.000000000001) and not ignore_range_error:

But I'd imagine there's better fix than this.

Thanks for creating and maintaining pyCirclize, it's a very useful tool!

[moshi4]

Hi @robby-wang,

Thank you for reporting this bug. I will try to fix it in the next release. Similar issue #27.