will you help me to fix it. i got this error message with the installation.

$ python setup.py install
Traceback (most recent call last):
File "setup.py", line 16, in module
long_description = open('README.md','r').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 0x81 in position 2545: character maps to undefined