Merge pull request pallets#1814 from pallets/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Author: davidism

.pre-commit-config.yaml

@@ -14,7 +14,7 @@ repos:
     hooks:
       - id: black
   - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.4
+    rev: 3.9.0
     hooks:
       - id: flake8
         additional_dependencies: