在hosts文件中添加以下内容即可解决问题~

185.199.108.154               github.githubassets.com
199.232.68.133                camo.githubusercontent.com
199.232.68.133                github.map.fastly.net
199.232.69.194                github.global.ssl.fastly.net
140.82.113.4                  gist.github.com
185.199.108.153               github.io
140.82.114.3                  github.com
52.136.126.124                api.github.com
199.232.68.133                raw.githubusercontent.com
199.232.68.133                user-images.githubusercontent.com
199.232.68.133                favicons.githubusercontent.com
199.232.68.133                avatars5.githubusercontent.com
199.232.68.133                avatars4.githubusercontent.com
199.232.68.133                avatars3.githubusercontent.com
199.232.68.133                avatars2.githubusercontent.com
199.232.68.133                avatars1.githubusercontent.com
199.232.68.133                avatars0.githubusercontent.com
140.82.114.9                  codeload.github.com
52.216.128.147                github-cloud.s3.amazonaws.com
52.216.10.59                  github-com.s3.amazonaws.com
52.216.107.188                github-production-release-asset-2e65be.s3.amazonaws.com
52.217.1.4                    github-production-user-asset-6210df.s3.amazonaws.com
52.217.67.196                 github-production-repository-file-5c1aeb.s3.amazonaws.com

hosts 文件在每个系统的位置不一，具体如下：

• Windows 系统：C:\Windows\System32\drivers\etc\hosts
• Linux 系统：/etc/hosts
• Mac（苹果电脑）系统：/etc/hosts
• Android（安卓）系统：/system/etc/hosts
• iPhone（iOS）系统：/etc/hosts

大部分情况下是直接生效，如未生效可尝试下面的办法，刷新 DNS：

Windows：在 CMD 窗口输入：ipconfig /flushdns

Linux 命令：sudo rcnscd restart

Mac 命令：sudo killall -HUP mDNSResponder

Tips： 上述方法无效可以尝试重启机器。