Merge pull request #346 from pre-commit/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Author: asottile

.pre-commit-config.yaml

@@ -38,6 +38,6 @@ repos:
     -   id: flake8
         exclude: ^identify/vendor/licenses\.py$
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.990
+    rev: v0.991
     hooks:
     -   id: mypy