Upgrade add-trailing-comma

Author: asottile

.pre-commit-config.yaml

@@ -27,6 +27,6 @@
     hooks:
     -   id: pyupgrade
 -   repo: https://github.com/asottile/add-trailing-comma
-    sha: v0.5.1
+    sha: v0.6.1
     hooks:
     -   id: add-trailing-comma