corrected the flake8 errors
corrected the flake8 errors

untitaker/vdirsyncer,hobarrera/vdirsyncer,hobarrera/vdirsyncer,tribut/vdirsyncer,untitaker/vdirsyncer,untitaker/vdirsyncer,tribut/vdirsyncer,credativUK/vdirsyncer,credativUK/vdirsyncer