Upgrade pyflakes version to 1.5.0
Upgrade pyflakes version to 1.5.0

jssjr/carbonate,criteo-forks/carbonate,graphite-project/carbonate,graphite-project/carbonate,jssjr/carbonate,graphite-project/carbonate,deniszh/carbonate,deniszh/carbonate,deniszh/carbonate,jssjr/carbonate,criteo-forks/carbonate,criteo-forks/carbonate