Fix style of `setup.cfg`
Fix style of `setup.cfg`

pfnet/chainer,niboshi/chainer,hvy/chainer,hvy/chainer,chainer/chainer,chainer/chainer,niboshi/chainer,chainer/chainer,wkentaro/chainer,wkentaro/chainer,chainer/chainer,hvy/chainer,hvy/chainer,niboshi/chainer,niboshi/chainer,wkentaro/chainer,wkentaro/chainer