CLN: Remove encoding specifier
- [ ] closes #xxxx
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

LGTM What is the point of doing this? > What is the point of doing this?

I'm pretty sure this is a py2 holdover > > What is the point of doing this?
> 
> I'm pretty sure this is a py2 holdover

Correct, there is no need to specify the encoding (if it's utf8), in python3 thanks @MomIsBestFriend 