Update license with up-to-date year
Update license with up-to-date year

RobertoMalatesta/plottable,iobeam/plottable,softwords/plottable,danmane/plottable,onaio/plottable,palantir/plottable,iobeam/plottable,danmane/plottable,onaio/plottable,NextTuesday/plottable,RobertoMalatesta/plottable,jacqt/plottable,onaio/plottable,jacqt/plottable,palantir/plottable,NextTuesday/plottable,alyssaq/plottable,danmane/plottable,iobeam/plottable,palantir/plottable,gdseller/plottable,jacqt/plottable,RobertoMalatesta/plottable,softwords/plottable,gdseller/plottable,softwords/plottable,alyssaq/plottable,alyssaq/plottable,NextTuesday/plottable,gdseller/plottable,palantir/plottable