Ignore either of W503 or W504 flake8 warnings

Also clean up YAML files with yamllint.

.github/workflows/codespell-private.yml

@@ -1,6 +1,7 @@
 # GitHub Action to check our dictionary, this should only be used by the codespell project itself
 # For general usage in your repo, see the example in codespell.yml
 # https://github.com/codespell-project/codespell
+---
 name: codespell
 on: [push, pull_request]
 jobs:
@@ -45,7 +46,7 @@ jobs:
         uses: actions/setup-python@v2
       - uses: actions/checkout@v2
       - name: Install general dependencies
-        run: pip install -U pip wheel # upgrade to latest pip find 3.5 wheels; wheel to avoid errors
+        run: pip install -U pip wheel  # upgrade to latest pip find 3.5 wheels; wheel to avoid errors
       - name: Install codespell dependencies
         run: pip install -e ".[dev]"
       - uses: codespell-project/sort-problem-matcher@v1
@@ -56,4 +57,4 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Flake8 with annotations
-        uses: TrueBrain/actions-flake8@v1.2
+        uses: TrueBrain/actions-flake8@v2

appveyor.yml

@@ -1,3 +1,4 @@
+---
 clone_depth: 50
 
 environment:
@@ -14,14 +15,14 @@ cache:
 install:
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
   - "pip install codecov chardet setuptools"
-  - "pip install -e \".[dev]\"" # install the codespell dev packages
+  - "pip install -e \".[dev]\""  # install the codespell dev packages
   - "python setup.py develop"
 
 build: false  # Not a C# project, build stuff at the test step instead.
 
 test_script:
   - "codespell --help"
-  - "flake8"
+  - "flake8 --ignore=W504"
   - "pytest codespell_lib"
 
 on_success:

setup.cfg

@@ -3,4 +3,4 @@ addopts = --cov=codespell_lib --showlocals -rs --cov-report=
 
 [flake8]
 exclude = build, ci-helpers
-ignore =
+ignore = W504