UnicodeDecodeError error when pip install

[bill10]

maybe some system package is missing on my machine?

this is the error msg. thanks for taking a look at it

Collecting mwxml
  Downloading mwxml-0.2.2.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/4504190.1.batch.q/glide_uyoMWw/execute/dir_13328/pip-build-9zncpm_y/mwxml/setup.py",
     line 26, in <module>
        long_description=open('README.md').read(),
      File "/tmp/4504190.1.batch.q/glide_uyoMWw/execute/dir_13328/miniconda3/envs/myenv/lib/python3.6/encodings/ascii.py", line 26, in decode
        return codecs.ascii_decode(input, self.errors)[0]
        UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 102: ordinal not in range(128)