GitHub-修改以下host-ip可加快访问速度

#GitHub START
207.97.227.239    github.com
204.232.175.94    gist.github.com
107.21.116.220    help.github.com
207.97.227.252    nodeload.github.com
107.22.3.110    status.github.com
204.232.175.78    training.github.com
207.97.227.243    www.github.com
204.232.175.90  github.com
#GitHub END