Add setuptools to setup_requires
Add setuptools to setup_requires

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