Hope to add a proxy option

[jhalx]

我发现无法正常使用live-server的代理功能,经过测试发现通过以下方法修改之后可以正常使用代理功能了
I found that the proxy function of the live-server cannot be used normally. After testing, I found that the proxy function can be used normally after modification by the following method:
具体方法:
specific method:
添加proxy定义,具体位置如下图

proxy?: string[][] | undefined;
增加配置项: