chore(package): update tslint to version 3.12.0
chore(package): update tslint to version 3.12.0

https://greenkeeper.io/
willsoto/ng-chartist,paradox41/angular2-chartist,paradox41/angular2-chartist,willsoto/angular2-chartist,willsoto/angular2-chartist,willsoto/ng-chartist,paradox41/angular2-chartist,willsoto/ng-chartist,willsoto/angular2-chartist