setup.py : Clarify the encoding when reading a file

[lilacs2039]

Environment

Windows 10 Pro

Problem

When I tried to pip install the package I created, the following encoding error occured.

Error Message

(Partially abbreviated in ...)

>pip install git+(my library)
Collecting git+(my library)
  Cloning ...
  Running command git clone ...
  Resolved ...
    ERROR: Command errored out with exit status 1:
     command: '...\Scripts\python.exe' -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\...\\pip-req-build-wpi8iw78\\setup.py'"'"'; ...
         cwd: C:\...
    Complete output (9 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "...\AppData\Local\Temp\pip-req-build-wpi8iw78\setup.py", line 14, in <module>
        config.read('settings.ini')
      File "...\AppData\Local\Programs\Python\Python39\lib\configparser.py", line 697, in read
        self._read(fp, filename)
      File "...\AppData\Local\Programs\Python\Python39\lib\configparser.py", line 1020, in _read
        for lineno, line in enumerate(fp, start=1):
    UnicodeDecodeError: 'cp932' codec can't decode byte 0xef in position 250: illegal multibyte sequence
    ----------------------------------------
WARNING: Discarding git+(my library). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Cause

Because the standard input / output of Windows is CP 932, the error occurred while reading a UTF-8 file.

Fixes

Because README.md and settings.ini are in UTF-8 encoding, clarified the encoding when reading the file.