Fix setup.cfg for flake8
Fix setup.cfg for flake8

ktnyt/chainer,kiyukuta/chainer,niboshi/chainer,truongdq/chainer,t-abe/chainer,sinhrks/chainer,t-abe/chainer,niboshi/chainer,pfnet/chainer,niboshi/chainer,okuta/chainer,cupy/cupy,chainer/chainer,chainer/chainer,kashif/chainer,hvy/chainer,ktnyt/chainer,cupy/cupy,wkentaro/chainer,wkentaro/chainer,AlpacaDB/chainer,okuta/chainer,chainer/chainer,sinhrks/chainer,hvy/chainer,cupy/cupy,keisuke-umezawa/chainer,anaruse/chainer,hvy/chainer,ktnyt/chainer,ronekko/chainer,jnishi/chainer,benob/chainer,okuta/chainer,wkentaro/chainer,tkerola/chainer,chainer/chainer,keisuke-umezawa/chainer,muupan/chainer,truongdq/chainer,kikusu/chainer,keisuke-umezawa/chainer,delta2323/chainer,cemoody/chainer,ktnyt/chainer,wkentaro/chainer,AlpacaDB/chainer,jnishi/chainer,okuta/chainer,cupy/cupy,hvy/chainer,keisuke-umezawa/chainer,benob/chainer,jnishi/chainer,rezoo/chainer,muupan/chainer,aonotas/chainer,niboshi/chainer,jnishi/chainer,ysekky/chainer,kikusu/chainer