style(gulpfile): use gulp.task instead of gulp.series whenever possible
style(gulpfile): use gulp.task instead of gulp.series whenever possible

rolandjitsu/angular-lab,rolandjitsu/ng2-play,rolandjitsu/ng2-lab,rolandjitsu/ng2-play,rolandjitsu/angular-lab,rolandjitsu/ng2-lab,rolandjitsu/angular-lab,rolandjitsu/ng2-play,rolandjitsu/ng2-lab,rolandjitsu/ng2-lab,rolandjitsu/angular-lab,rolandjitsu/ng2-play