[pre-commit.ci] pre-commit autoupdate

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
     -   id: black
         args: [--safe, --quiet]
 -   repo: https://github.com/asottile/blacken-docs
-    rev: v1.9.2
+    rev: v1.10.0
     hooks:
     -   id: blacken-docs
         additional_dependencies: [black==19.3b0]