Don't check examples and demo by flake8 on Python 3.4
Don't check examples and demo by flake8 on Python 3.4

aio-libs/aiohttp-debugtoolbar,aio-libs/aiohttp-debugtoolbar,aio-libs/aiohttp_debugtoolbar,realer01/aiohttp-debugtoolbar,realer01/aiohttp-debugtoolbar,aio-libs/aiohttp_debugtoolbar,aio-libs/aiohttp-debugtoolbar,aio-libs/aiohttp_debugtoolbar,realer01/aiohttp-debugtoolbar