fix(): corrected error message for missing plugin.
fix(): corrected error message for missing plugin.

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