Bump flake8-dunder-all version.

Author: domdfcoding

.pre-commit-config.yaml

@@ -40,7 +40,7 @@ repos:
     - id: bind-requirements
 
  - repo: https://github.com/domdfcoding/flake8-dunder-all
-   rev: v0.2.0
+   rev: v0.2.1
    hooks:
     - id: ensure-dunder-all
       files: ^domdf_python_tools/.*\.py$