follow flake8
follow flake8

for trailing spaces.
kiyukuta/chainer,chainer/chainer,niboshi/chainer,keisuke-umezawa/chainer,ronekko/chainer,hvy/chainer,jnishi/chainer,chainer/chainer,ktnyt/chainer,niboshi/chainer,cupy/cupy,jnishi/chainer,ysekky/chainer,chainer/chainer,okuta/chainer,niboshi/chainer,okuta/chainer,ktnyt/chainer,anaruse/chainer,okuta/chainer,pfnet/chainer,tkerola/chainer,keisuke-umezawa/chainer,jnishi/chainer,ktnyt/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,wkentaro/chainer,hvy/chainer,wkentaro/chainer,rezoo/chainer,cupy/cupy,wkentaro/chainer,kashif/chainer,ktnyt/chainer,hvy/chainer,delta2323/chainer,cupy/cupy,cupy/cupy,wkentaro/chainer,chainer/chainer,aonotas/chainer,niboshi/chainer,hvy/chainer,jnishi/chainer,okuta/chainer