[pre-commit.ci] pre-commit autoupdate (#41)

updates:
- [github.com/pre-commit/pre-commit-hooks: v2.3.0 → v4.0.1](pre-commit/pre-commit-hooks@v2.3.0...v4.0.1)
- [github.com/psf/black: 20.8b1 → 21.8b0](psf/black@20.8b1...21.8b0)
- [github.com/pycqa/isort: 5.7.0 → 5.9.3](PyCQA/isort@5.7.0...5.9.3)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -1,14 +1,14 @@
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v2.3.0
+  rev: v4.0.1
   hooks:
   - id: trailing-whitespace
 - repo: https://github.com/psf/black
-  rev: 20.8b1  # https://github.com/psf/black/tags
+  rev: 21.8b0
   hooks:
   - id: black
     language_version: python3
 - repo: https://github.com/pycqa/isort
-  rev: 5.7.0
+  rev: 5.9.3
   hooks:
   - id: isort