CLN: remove trailing commas for black update
File edited: 
pandas/tests/io/test_sql.py
Hello @Noahlq! 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 2020-09-19 18:15:20 UTC Hi @Noahlq 

Workflow here should be:

- update black to new version
- run black on files
- for the lines that have changed, try removing trailing commas
- run black on files again
- downgrade black to current version, check nothing changes