ProgressBarBuilder()#setEtaFunction is pointless because all methods in ProgressState are package-private

[natanfudge]

setEtaFunction accepts a (BiFunction<ProgressState, Duration, Optional<Duration>>, but it's impossible to use ProgressState for consumers because everything there is package-private. setEtaFunction should either accept a Bifunction that provides objects that are actually usable, or ProgressState and its methods should become public.

[ctongfei]

Thanks @natanfudge ! My fault, will have to make that class public.

[ctongfei]

See #146: I think a better way is to change setETAFunction so that it accepts BiFunction<ProgressBar, Duration, Optional<Duration>>. Let me know if you have any objections.

[ctongfei]

Fixed in 0.9.5.