update black to not break on markdown files

Author: ianhi

.pre-commit-config.yaml

@@ -25,7 +25,7 @@ repos:
       - id: black-jupyter
 
   - repo: https://github.com/keewis/blackdoc
-    rev: v0.4.5
+    rev: v0.4.6
     hooks:
       - id: blackdoc