scrooloose/syntastic flake8 ignore E501

$ vi .vimrc.bundles

Bundle 'scrooloose/syntastic'
let g:syntastic_python_checkers=['flake8']
let g:syntastic_python_flake8_args='--ignore=E501'

References :
vim - Disable pep8 check in syntastic for python files - Stack Overflow
let g:syntastic_python_flake8_args doesn't work · Issue #508 · scrooloose/syntastic