fix(package.json): fix "pack" script.
fix(package.json): fix "pack" script.

willsoto/ng-chartist,paradox41/angular2-chartist,willsoto/angular2-chartist,willsoto/angular2-chartist,willsoto/angular2-chartist,willsoto/ng-chartist,paradox41/angular2-chartist,willsoto/ng-chartist,paradox41/angular2-chartist