Installation issue on Windows

[martinRenou]

As demonstrated in this PR: #120 there is an installation issue on Windows:

  Traceback (most recent call last):
    File "c:\hostedtoolcache\windows\python\3.6.8\x64\lib\site-packages\pip\_vendor\pep517\_in_process.py", line 280, in <module>
      main()
    File "c:\hostedtoolcache\windows\python\3.6.8\x64\lib\site-packages\pip\_vendor\pep517\_in_process.py", line 263, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "c:\hostedtoolcache\windows\python\3.6.8\x64\lib\site-packages\pip\_vendor\pep517\_in_process.py", line 114, in get_requires_for_build_wheel
      return hook(config_settings)
    File "C:\Users\RUNNER~1\AppData\Local\Temp\pip-build-env-dt8e78rv\overlay\Lib\site-packages\setuptools\build_meta.py", line 155, in get_requires_for_build_wheel
      config_settings, requirements=['wheel'])
    File "C:\Users\RUNNER~1\AppData\Local\Temp\pip-build-env-dt8e78rv\overlay\Lib\site-packages\setuptools\build_meta.py", line 135, in _get_build_requires
      self.run_setup()
    File "C:\Users\RUNNER~1\AppData\Local\Temp\pip-build-env-dt8e78rv\overlay\Lib\site-packages\setuptools\build_meta.py", line 259, in run_setup
      self).run_setup(setup_script=setup_script)
    File "C:\Users\RUNNER~1\AppData\Local\Temp\pip-build-env-dt8e78rv\overlay\Lib\site-packages\setuptools\build_meta.py", line 150, in run_setup
      exec(compile(code, __file__, 'exec'), locals())
    File "setup.py", line 35, in <module>
      setup(long_description=make_pypi_compliant_readme())
    File "setup.py", line 22, in make_pypi_compliant_readme
      original_readme = fp.read()
    File "c:\hostedtoolcache\windows\python\3.6.8\x64\lib\encodings\cp1252.py", line 23, in decode
      return codecs.charmap_decode(input,self.errors,decoding_table)[0]
  UnicodeDecodeError: 'charmap' codec can't decode byte 0x90 in position 18459: character maps to <undefined>