Update flake8 from 3.7.6 to 3.7.7
Update flake8 from 3.7.6 to 3.7.7

pydanny/cookiecutter-django,Parbhat/cookiecutter-django-foundation,luzfcb/cookiecutter-django,ryankanno/cookiecutter-django,ryankanno/cookiecutter-django,pydanny/cookiecutter-django,Parbhat/cookiecutter-django-foundation,trungdong/cookiecutter-django,luzfcb/cookiecutter-django,ad-m/cookiecutter-django,trungdong/cookiecutter-django,trungdong/cookiecutter-django,Parbhat/cookiecutter-django-foundation,ad-m/cookiecutter-django,Parbhat/cookiecutter-django-foundation,ad-m/cookiecutter-django,luzfcb/cookiecutter-django,pydanny/cookiecutter-django,ryankanno/cookiecutter-django,pydanny/cookiecutter-django,ad-m/cookiecutter-django,trungdong/cookiecutter-django,luzfcb/cookiecutter-django,ryankanno/cookiecutter-django