Update Sparkle framework

[abyssoft]

The framework should be updated to fix the security issue in the previous version.

[egirsova]

I just tried updating the Sparkle framework and there weren't any conflicts with the code. The only issue is that Sparkle now requires that you access the feed using HTTPS rather than HTTP. This results in a warning message when you run Teleport:

And, as far as I know, your website does not support SSL. I think you'll have to secure your website with SSL before you update to the new Sparkle framework.

[johndbritton]

Seems that you were able to find a workaround to fix your issue. I have experienced similar and the workaround I used was to move the displays in the configuration panel on the main computer. It seemed to be caused by the fact that Teleport wasn't correctly detecting the edge of the screen.

The latest release v1.2.2 is working on macOS Big Sur. Give it a try, if you have any problems please open an issue with full steps to reproduce.

That comment was meant for a different issue.

[johndbritton]

We're going to need a whole new updates system. Closing this in favor of #57