UnicodeDecodeError in setup.py

[LukeHollingsworth]

The following line:

with open("README.md", "r") as fh:
    long_description = fh.read()

on line 5 of setup.py raises the following error: "UnicodeDecodeError: 'charmap' codec can't decode byte 0x8d in position 8698: character maps to ".

Suggest following correction:

with open("README.md", "r", encoding="utf-8") as fh:
    long_description = fh.read()

[niksirbi]

This no longer seems to be an issue after the move from setup.py to pyproject.toml (see #50). Should we close it?