Fix typo

Author: sloria

.pre-commit-config.yaml

@@ -19,7 +19,7 @@ repos:
   hooks:
   - id: blacken-docs
     additional_dependencies: [black==20.8b1]
-# Use a local hook to run because the official hook runs mypy in a venv
+# Use a local hook to run mypy because the official hook runs mypy in a venv
 # that doesn't have dependencies or their type annotations installed.
 - repo: local
   hooks: