[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/add-trailing-comma: v2.1.0 → v2.2.0](asottile/add-trailing-comma@v2.1.0...v2.2.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -32,7 +32,7 @@ repos:
     -   id: pyupgrade
         args: [--py36-plus]
 -   repo: https://github.com/asottile/add-trailing-comma
-    rev: v2.1.0
+    rev: v2.2.0
     hooks:
     -   id: add-trailing-comma
         args: [--py36-plus]