feat(installVueDevtools): support proxy auth, fixes #379

Author: nklayman

lib/installVueDevtools/utils.js

@@ -1,7 +1,7 @@
 import electron, { remote } from 'electron'
 import fs from 'fs'
-import path from 'path'
 import https from 'https'
+import path from 'path'
 
 export const getPath = () => {
   const savePath = (remote || electron).app.getPath('userData')
@@ -15,6 +15,9 @@ const request = net ? net.request : https.get
 export const downloadFile = (from, to) =>
   new Promise((resolve, reject) => {
     const req = request(from)
+    req.on('login', (authInfo, callback) => {
+      callback(process.env.VUE_DEVTOOLS_PROXY_USER, process.env.VUE_DEVTOOLS_PROXY_PASSWORD)
+    })
     req.on('response', res => {
       // Shouldn't handle redirect with `electron.net`, this is for https.get fallback
       if (