docs(readme): remove ref to webpack
docs(readme): remove ref to webpack

kojinkai/predictor-ionic,marcoturi/ionic2-boilerplate,kojinkai/predictor-ionic,kojinkai/predictor-ionic,StephanGieffers/ionic-fb-playground,marcoturi/ionic-boilerplate,marcoturi/ionic2-boilerplate,marcoturi/ionic2-boilerplate,marcoturi/ionic-boilerplate,marcoturi/ionic2-boilerplate,StephanGieffers/ionic-fb-playground,marcoturi/ionic-boilerplate,kojinkai/predictor-ionic,StephanGieffers/ionic-fb-playground,marcoturi/ionic-boilerplate,StephanGieffers/ionic-fb-playground