Pin flake8 to latest version 3.4.1 (#501)
Pin flake8 to latest version 3.4.1 (#501)


pheanex/xpython,behrtam/xpython,mweb/python,jmluy/xpython,mweb/python,smalley/python,smalley/python,exercism/xpython,N-Parsons/exercism-python,jmluy/xpython,pheanex/xpython,exercism/xpython,exercism/python,behrtam/xpython,exercism/python,N-Parsons/exercism-python