Run flake8 in CI, refs #291

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
           ${{ runner.os }}-pip-
     - name: Install dependencies
       run: |
-        pip install -e '.[test,mypy]'
+        pip install -e '.[test,mypy,flake8]'
     - name: Optionally install numpy
       if: matrix.numpy == 1
       run: pip install numpy
@@ -34,5 +34,7 @@ jobs:
         pytest
     - name: run mypy
       run: mypy sqlite_utils
+    - name: run flake8
+      run: flake8
     - name: Check formatting
       run: black . --check

setup.py

@@ -28,6 +28,7 @@ setup(
         "test": ["pytest", "black", "hypothesis"],
         "docs": ["sphinx_rtd_theme", "sphinx-autobuild"],
         "mypy": ["mypy", "types-click", "types-tabulate"],
+        "flake8": ["flake8"],
     },
     entry_points="""
         [console_scripts]