feature: windows的系统代理排除列表中，排除掉中国域名白名单，并提供自动更新中国域名白名单的功能

packages/mitmproxy/src/lib/proxy/middleware/source/pac.js

@@ -19,7 +19,7 @@ function createPacClient (pacFilePath) {
 
   const getRules = function (pacFilePath) {
     let text = readFile(pacFilePath)
-    if (text.indexOf('!---------------------EOF') === -1) {
+    if (text.indexOf('!---------------------EOF') < 0) {
       text = Buffer.from(text, 'base64').toString()
     }
     const rules = []