Misleading error for pd.read_msgpack
- [x] closes #27160 
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry


I'm not really sure why it fails on Linting We just merged in a PR to use black as a code formatting tool. If you install that and run locally against pandas/io/packers.py and pandas/tests/io/test_packers.py I think should resolve Hello @U09Kane! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:









There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2019-07-05 22:08:47 UTC Hopefully, everything is good now. thanks sticking it out @U09Kane 

nice patch! Thanks for the feedback