When using the sparkline chart in angular-nvds we might want to hide the end value when creating tiny sparlines
Answer to this question https://stackoverflow.com/questions/34864193/angular-nvd3-sparkline-and-trailing-currentvalue-number/53314759#53314759
just set the undocumented* option showLastValue
`$scope.options = { chart: { type: 'sparklinePlus',