add flake8

.pre-commit-config.yaml

@@ -30,4 +30,9 @@ repos:
     rev: 20.8b1 # Replace by any tag/version: https://github.com/psf/black/tags
     hooks:
     -   id: black
-        language_version: python3.8 # Should be a command that runs python3.6+
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+        language_version: python3.8 # Should be a command that runs python3.6+
+-   repo: https://github.com/pycqa/flake8
+    rev: '3.9.0'  # pick a git hash / tag to point to
+    hooks:
+    -   id: flake8
+    
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pyproject.toml

 [tool.black]
 line-length = 127
 target-version = ['py36', 'py37', 'py38']
-include = '\.pyi?$'
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+include = '\.pyi?$'
+
+[flake8]
+max-line-length = 127
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