[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/pre-commit/mirrors-mypy: v0.930 → v0.931](pre-commit/mirrors-mypy@v0.930...v0.931)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -33,7 +33,7 @@ repos:
     -   id: add-trailing-comma
         args: [--py36-plus]
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.930
+    rev: v0.931
     hooks:
     -   id: mypy
         additional_dependencies: [types-all]