[pre-commit.ci] pre-commit autoupdate

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

.pre-commit-config.yaml

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4c42d39..76a886c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -32,7 +32,7 @@
     -   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]