Now that dart-code-metrics has been updated, this lint can finally be
used. So far all of these are false positives, in the sense that I don't
care about their return values.
I wish there was an easy way of marking functions whose return value
shouldn't ever be ignored.
Platform from dart:io cannot be used on the web for reasons. And this
way we get a fake File/Directory class which we can use for atleast
running the web version, even if it won't work.
