chore(webpack): add optimize plugins
chore(webpack): add optimize plugins

michaelgeorgeattard/ionic-app-scripts,rolandjitsu/ionic-app-scripts,rolandjitsu/ionic-app-scripts,michaelgeorgeattard/ionic-app-scripts,driftyco/ionic-app-scripts,driftyco/ionic-app-scripts,driftyco/ionic-app-scripts,michaelgeorgeattard/ionic-app-scripts,rolandjitsu/ionic-app-scripts