Bump darker from 1.2.3 to 1.2.4

.editorconfig

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+root = true

.flake8

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+# https://flake8.pycqa.org/en/latest/user/configuration.html
+[flake8]
+exclude = .svn,CVS,.bzr,.hg,.git,__pycache__,.venv,test
+# Recommend matching the black line length (default 88),
+# rather than using the flake8 default of 79:
+max-line-length = 88
+extend-ignore =
+    # See https://github.com/PyCQA/pycodestyle/issues/373
+    E203,
+    # W503, # line break before binary operator
+    # E722, # do not use bare 'except'
+    # B009, # Do not call getattr with a constant attribute value
+    # E501, # line too long
+    # B007, # Loop control variable ? not used within the loop body.
+    # E402, # module level import not at top of file
+    # F401, # ? imported but unused
+    # E231, # missing whitespace after ','

.pre-commit-config.yaml

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+# https://pre-commit.com/
+# pre-commit run --all-files -vvv
+repos:
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.8.2
+    hooks:
+      - id: flake8
+        additional_dependencies:
+          - flake8-bugbear
+          - flake8-black
+        files: '(rdflib|test)/.*[.]py'
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.800
+    hooks:
+      - id: mypy
+        files: '(rdflib|test)/.*[.]py'
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.1.0
+    hooks:
+      - id: check-byte-order-marker
+      - id: trailing-whitespace
+      - id: end-of-file-fixer

.vscode/settings.json

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+{
+  "python.linting.flake8Enabled": false,
+  "python.linting.pylintEnabled": false,
+}

Pipfile

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+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+html5lib = "*"
+isodate = "*"
+pyparsing = "*"
+
+[dev-packages]
+sphinxcontrib-apidoc = "*"
+nose = "==1.3.7"
+nose-timer = "*"
+coverage = "*"
+flake8 = "*"
+doctest-ignore-unicode = "==0.1.2"
+Sphinx = "*"
+
+[requires]
+python_version = "3.9"

mypy.ini

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+# https://mypy.readthedocs.io/en/stable/config_file.html
+[mypy]
+python_version = 3.6
+warn_unused_configs = True
+ignore_missing_imports = True
+disallow_subclassing_any = False