pip3 error: 'charmap' codec can't decode byte 0x81 in position 876

Even after upgrading pip to the latest version I'm getting this error when I attempt to install:

```
λ pip3 install xls-cli
Collecting xls-cli
Using cached xls_cli-1.0.2-py3-none-any.whl (5.3 kB)
Collecting getkey
Using cached getkey-0.6.5.tar.gz (13 kB)
ERROR: Command errored out with exit status 1:
command: 'c:\python38\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\chunsberger\\AppData\\Local\\Temp\\pip-install-2p3rqeim\\getkey\\setup.py'"'"'; __file__='"'"'C:\\Users\\chunsberger\\AppData\\Local\\Temp\\pip-install-2p3rqeim\\getkey\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base 'C:\Users\chunsberger\AppData\Local\Temp\pip-install-2p3rqeim\getkey\pip-egg-info'
cwd: C:\Users\chunsberger\AppData\Local\Temp\pip-install-2p3rqeim\getkey\
Complete output (9 lines):
Traceback (most recent call last):
File "", line 1, in
File "C:\Users\chunsberger\AppData\Local\Temp\pip-install-2p3rqeim\getkey\setup.py", line 37, in
long_description=read_description(),
File "C:\Users\chunsberger\AppData\Local\Temp\pip-install-2p3rqeim\getkey\setup.py", line 11, in read_description
return fd.read()
File "c:\python38\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 876: character maps to
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
```