Ran pre-commit migrate-config.

Committed via https://github.com/asottile/all-repos

.pre-commit-config.yaml

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 0104614..5fed7da 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,3 +1,4 @@
+repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
     sha: v0.9.2
     hooks: