make "licence" consistent in `CONTRIBUTING.md`
make "licence" consistent in `CONTRIBUTING.md`
deathping1994/moz-games,mozilla/moz-games,potch/moz-games,mozilla/moz-gdc,deathping1994/moz-games,chirilo/moz-games,potch/moz-games,mozilla/moz-gdc,mozilla/moz-games,chirilo/moz-games