Yes. I deleted the max-version string in appinfo/info.xml, deactivated the app and reactivated it again. It still works fine. Alas, the string seems not to be required.
It’s just: I don’t know, if this will be an error in future versions of NC pretty much like a missing min- and max-version string for NC will be.
pinging @LukasReschke: any plans on that? Or is it safe to not set a max-php-version?
If it turns out, that we need to set a max-version: my php version the app runs fine with is 7.0.6
John