allow for passing in applicationID

[quite]

Would you consider adding support for passing a custom applicationID to the Notify() method? Perhaps it could be solved using the functional options pattern, to avoid breaking API.

Also, I can't really understand why beeep digs out that powershell appID for use in toastNotify? Why powershell? Because, like, go-toast happens to use some powershell-shenanigans to actually show the toast? But then you get the powershell icon/name in the title of the toast. It would make sense to be if users of beeep could instead set the appID