Fix str literal for readability
Fix str literal for readability

benob/chainer,ronekko/chainer,kikusu/chainer,wkentaro/chainer,hvy/chainer,woodshop/complex-chainer,cupy/cupy,jnishi/chainer,niboshi/chainer,delta2323/chainer,tscohen/chainer,kashif/chainer,keisuke-umezawa/chainer,anaruse/chainer,wkentaro/chainer,ytoyama/yans_chainer_hackathon,chainer/chainer,muupan/chainer,cemoody/chainer,kikusu/chainer,truongdq/chainer,tigerneil/chainer,okuta/chainer,okuta/chainer,laysakura/chainer,AlpacaDB/chainer,bayerj/chainer,sinhrks/chainer,jnishi/chainer,woodshop/chainer,chainer/chainer,niboshi/chainer,tkerola/chainer,pfnet/chainer,hidenori-t/chainer,muupan/chainer,okuta/chainer,yanweifu/chainer,wkentaro/chainer,cupy/cupy,Kaisuke5/chainer,cupy/cupy,chainer/chainer,t-abe/chainer,ikasumi/chainer,hvy/chainer,rezoo/chainer,jfsantos/chainer,ktnyt/chainer,chainer/chainer,hvy/chainer,1986ks/chainer,elviswf/chainer,minhpqn/chainer,aonotas/chainer,cupy/cupy,keisuke-umezawa/chainer,jnishi/chainer,t-abe/chainer,ysekky/chainer,okuta/chainer,niboshi/chainer,kuwa32/chainer,wavelets/chainer,keisuke-umezawa/chainer,ktnyt/chainer,umitanuki/chainer,benob/chainer,hvy/chainer,niboshi/chainer,AlpacaDB/chainer,sou81821/chainer,sinhrks/chainer,wkentaro/chainer,truongdq/chainer,keisuke-umezawa/chainer,masia02/chainer,ktnyt/chainer,kiyukuta/chainer,jnishi/chainer,ktnyt/chainer