Add flake8 into requirements.txt
Add flake8 into requirements.txt

archyufa/CloudFerry,archyufa/CloudFerry,plomakin/CloudFerry,SVilgelm/CloudFerry,ntymtsiv/CloudFerry,japaniel/CloudFerry,andybondar/CloudFerry,mirrorcoder/CloudFerry,roman-verchikov/CloudFerry,SVilgelm/CloudFerry,ntymtsiv/CloudFerry,andybondar/CloudFerry,realsystem/CloudFerry,SVilgelm/CloudFerry,andybondar/CloudFerry,MirantisWorkloadMobility/CloudFerry,plomakin/CloudFerry,mgrygoriev/CloudFerry,archyufa/CloudFerry,japaniel/CloudFerry,roman-verchikov/CloudFerry,MirantisWorkloadMobility/CloudFerry,ntymtsiv/CloudFerry,archyufa/CloudFerry,MirantisWorkloadMobility/CloudFerry,mirrorcoder/CloudFerry,mgrygoriev/CloudFerry,japaniel/CloudFerry,realsystem/CloudFerry,miarmak/CloudFerry,roman-verchikov/CloudFerry,SVilgelm/CloudFerry,miarmak/CloudFerry,realsystem/CloudFerry,andybondar/CloudFerry,mgrygoriev/CloudFerry,roman-verchikov/CloudFerry,Settis/CloudFerry,ntymtsiv/CloudFerry,mgrygoriev/CloudFerry,japaniel/CloudFerry,MirantisWorkloadMobility/CloudFerry,toha10/CloudFerry,realsystem/CloudFerry