refactor(plugins): use yarn for checking versions if --yarn
refactor(plugins): use yarn for checking versions if --yarn

driftyco/ionic-cli,devtotvs/thf-mobile-cli,ricardo-mello/ionic-cli,devtotvs/thf-mobile-cli,ricardo-mello/ionic-cli,driftyco/ionic-cli,devtotvs/thf-mobile-cli,ricardo-mello/ionic-cli,driftyco/ionic-cli