There seems to be an issue in the default setup.py which comes with the Python 3.6.5 installer. Upon trying to install an additional package through pip the below is observed:

C:\Users\adamj\Desktop>pip install stegano
Collecting stegano
  Downloading https://files.pythonhosted.org/packages/77/76/07a61c042ac1a1cb3445689b4f140800b16d0e883a46049e221d7a92de66/Stegano-0.8.4.tar.gz (243kB)
    100% |████████████████████████████████| 245kB 3.3MB/s
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\adamj\AppData\Local\Temp\pip-install-sh3rd6wj\stegano\setup.py", line 26, in <module>
        readme = f.read()
      File "c:\python36\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 1569: character maps to <undefined>

We don't having to do with the stegano project. It looks like they specified the wrong encoding in their setup.py. (This also isn't the issue tracker for pip, but I don't think they have the bug.)