CORS issues lately

[WolfspiritM]

Hi,

With Chromium Edge lately there has been a CORS issue when connecting to sync.herokuapp. I think it has to do with the bump of socket io as it introduced "cors: false".

Also the URL set via the options window doesn't work as it's not being used. Not sure why. So I had to do a workaround to self host but with cors: true connection works as expected.