Merge pull request #329 from sass/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Author: asottile

.pre-commit-config.yaml

@@ -16,6 +16,6 @@ repos:
     hooks:
     -   id: pyupgrade
 -   repo: https://github.com/asottile/add-trailing-comma
-    rev: v2.0.2
+    rev: v2.1.0
     hooks:
     -   id: add-trailing-comma