remove trailing commas for #35925
- [x] pandas/io/parquet.py
- [x] pandas/io/parsers.py
- [x] pandas/io/pytables.py

xref #35925 Thanks @rajanshoo25 for the PR. generally lgtm. @rajanshoo25 CI / Checks (pull_request) failing. need to run black again after the changes

```
black, version 19.10b0
Checking black formatting
would reformat /home/runner/work/pandas/pandas/pandas/io/parsers.py
Oh no! 💥 💔 💥
1 file would be reformatted, 1122 files would be left unchanged.
```

 Thanks @rajanshoo25  > Thanks @rajanshoo25

Thanks a lot! @simonjayhawkins for guiding me. Actually I am new in open-source contribution.