Huge memory leak when menubar running for a long time

[sn0crash]

I apologize for not attaching any leak analysis, but in Activity Monitor, Nightscout is using 2 GiB of real memory after running for several weeks.

[erobinson]

Looks like this is an issue that stems from PyObjC that rumps leverages - https://github.com/jaredks/rumps/issues/64.

Not sure that there is a simple solution within the app. May need to hack around it, like restarting the app once a day.