2019.2 dev updateapp
Add "updateapp" function to "bootkali".
This allows to update the nethunter app if it has been installed as a privileged system app, via the following commands in an su Android terminal:
bootkali updateapp will replace the nethunter app with "https://images.offensive-security.com/latest.apk"
bootkali updateapp https://foo.bar/new.apk will replace the nethunter app with "new.apk" from "https://foo.bar/"