Check for updates when feed URL is set

src/browser/auto-updater-win32.coffee

@@ -10,6 +10,9 @@ class AutoUpdater
   _.extend @prototype, EventEmitter.prototype
 
   setFeedUrl: (@updateUrl) ->
+    if @updateUrl
+      # Schedule an update when the feed URL is set
+      process.nextTick => @checkForUpdates()
 
   quitAndInstall: ->
     updateDotExe = @getUpdateExePath()