Add success message

Also increase retries to 5 attempts.

script/upload-to-github.js

@@ -2,6 +2,10 @@ const GitHub = require('github')
 const github = new GitHub()
 github.authenticate({type: 'token', token: process.env.ELECTRON_GITHUB_TOKEN})
 
+if (process.argv.length < 5) {
+  console.log('Usage: upload-to-github filePath fileName releaseId')
+  process.exit(1)
+}
 let filePath = process.argv[2]
 let fileName = process.argv[3]
 let releaseId = process.argv[4]
@@ -14,15 +18,16 @@ let githubOpts = {
   name: fileName
 }
 
-let retry = true
+let retry = 0
 
 function uploadToGitHub () {
   github.repos.uploadAsset(githubOpts).then(() => {
+    console.log(`Successfully uploaded ${fileName} to GitHub.`)
     process.exit()
   }).catch((err) => {
-    if (retry) {
+    if (retry < 4) {
       console.log(`Error uploading ${fileName} to GitHub, will retry.  Error was:`, err)
-      retry = false
+      retry++
       uploadToGitHub()
     } else {
       console.log(`Error retrying uploading ${fileName} to GitHub:`, err)