we don't have pytest-flake8 yet

Index: pytest.ini
--- pytest.ini.orig
+++ pytest.ini
@@ -1,5 +1,5 @@
 [pytest]
-addopts = -v --flake8 --cov-report xml --cov-report=term-missing --cov=josepy --cov-config .coveragerc
+addopts = -v --cov-report xml --cov-report=term-missing --cov=josepy --cov-config .coveragerc
 # SelectableGroups:DeprecationWarning is ignored because it is raised by
 # flake8. See https://github.com/PyCQA/flake8/issues/1397.
 # We also ignore our own deprecation warning about dropping Python 3.6 support.
@@ -8,4 +8,4 @@ filterwarnings =
     ignore:SelectableGroups:DeprecationWarning
     ignore:Python 3.6 support will be dropped:DeprecationWarning
 norecursedirs = *.egg .eggs dist build docs .tox
-flake8-ignore = W504 E501
+#flake8-ignore = W504 E501