Can't bind to 'margin' since it isn't a known property of 'nouislider'.

[Prashant-Yadav]

nouislider supports 'margin' options which determines the minimum distance between the handles, but this property is not added in the ng2-nouislider component.

My use-case is to restrict same values for start and end handles of the slider.

[tb]

Please make PR with new input and add it to inputsConfig