Merge pull request #333 from sass/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Author: asottile

.pre-commit-config.yaml

@@ -7,7 +7,7 @@ repos:
     -   id: check-yaml
     -   id: debug-statements
 -   repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.4
+    rev: 3.9.0
     hooks:
     -   id: flake8
         exclude: ^docs/conf.py