[pre-commit.ci] pre-commit autoupdate (#18)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -35,7 +35,7 @@ repos:
     - id: bind-requirements
 
  - repo: https://github.com/domdfcoding/flake8-dunder-all
-   rev: v0.1.3
+   rev: v0.1.4
    hooks:
     - id: ensure-dunder-all
       files: ^domdf_python_tools/.*\.py$