format update

[qiyanjun]

What does this PR do?

format update due to black version issues

Checklist

• [ x ] The title of your pull request should be a summary of its contribution.
• [ x ] Please write detailed description of what parts have been newly added and what parts have been modified. Please also explain why certain changes were made.
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• [ ] Add relevant tests. No quality testing = no merge.
• [ ] All public methods must have informative docstrings that work nicely with sphinx. For new modules/files, please add/modify the appropriate .rst file in TextAttack/docs/apidoc.'

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