[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

README.md

@@ -152,4 +152,3 @@ For code quality control, we use `pre-commit` hooks for formatting and type hint
 Try your best to add test cases for bug fixes and new features. We use `pytest` for testing.
 
 For documentation, we should try to follow the [Google Python docstrings style](https://sphinxcontrib-napoleon.readthedocs.io/en/latest/example_google.html).
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