Fix Issue #33

[matthewdeanmartin]

Warning goes away.

I did run the unit tests, on window I get this... but I didn't do anything with code related to that. I'm guessing it is not a cross platform unit test.

self = <encodings.cp1252.IncrementalDecoder object at 0x00000266205ECDD0>
input = b'Usage examples (command-line and programmatic use):\r\n\r\n- Standard one-line sparkline\r\nsparklines 3 1 4 1 5 9 2...6\x82\xe2\x96\x85 \xe2\x96\x85\xe2\x96\x82\xe2\x96\x88\xe2\x96\x84\xe2\x96\x81\xe2\x96\x84\xe2\x96\x81\xe2\x96\x83\r\n'
final = True

    def decode(self, input, final=False):
>       return codecs.charmap_decode(input,self.errors,decoding_table)[0]
E       UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 171: character maps to <undefined>

C:\Users\matth\AppData\Local\Programs\Python\Python311\Lib\encodings\cp1252.py:23: UnicodeDecodeError
================================================ short test summary info =================================================
FAILED tests/test_sparkline.py::test_demo_consistency - UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 171: character maps to <undefined>

[deeplook]

It's been released now as 0.5.0 and published on PyPI!