Drop pytest-flake8 (tholo/pytest-flake8#92)

Author: xen0l

requirements/requirements_dev.txt

@@ -15,6 +15,5 @@ pytest==6.2.5
 pytest-black==0.3.12
 pytest-cov==3.0.0
 pytest-datadir==1.4.1
-pytest-flake8==1.0.7
 pytest-mock==3.10.0
 pytest-pylint==0.18.0

tests/run.py

@@ -38,7 +38,6 @@
 
 if args.lint:
     lint_args = [
-        "--flake8",
         "--black",
         "--pylint",
         f"--pylint-rcfile={os.path.join(root_dir, '.pylintrc')}",