[pre-commit.ci] pre-commit autoupdate (#361)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -11,7 +11,7 @@ repos:
   - id: end-of-file-fixer
   - id: trailing-whitespace
 - repo: https://github.com/asottile/pyupgrade
-  rev: v2.25.0
+  rev: v2.26.0
   hooks:
   - id: pyupgrade
     args: [--py36-plus]