Update pre-commit (#396)

* Update pre-commit

* Use blacken-docs

Author: jarrodmillman

.pre-commit-config.yaml

@@ -3,7 +3,7 @@
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.1.0
+    rev: v4.2.0
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
@@ -28,8 +28,13 @@ repos:
         files: \.(html|md|yml|yaml)
         args: [--prose-wrap=preserve]
 
+  - repo: https://github.com/asottile/blacken-docs
+    rev: v1.12.1
+    hooks:
+      - id: blacken-docs
+
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.31.1
+    rev: v2.32.1
     hooks:
       - id: pyupgrade
         args: [--py37-plus]

requirements/developer.txt

@@ -1 +1 @@
-pre-commit>=2.18
+pre-commit>=2.19