Add feature "receive beta update"

[max5354]

Describe your suggested feature

Add option/feature to "receive beta updates" in vuetube. I mean there are already built in update manager but not option to receive beta update. So it will be great if you add receive beta updates option

Other details

No response

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
• [X] I have written a short but informative title.
• [X] I will fill out all of the requested information in this form.

[Frontesque]

There is a new updater in the latest unstable, I'll add a version to receive the unstable updates.