Add options param to update() to extend options
Add options param to update() to extend options

This little addition makes it possible to extend the options with the update() function.

This is useful if you need to change the labelInterpolationFnc together with changed data.
Tested in my current project without issues.
chartist-js/chartist,hansmaad/chartist-js,cr3ative/chartist-js,gionkunz/chartist-js,chartist-js/chartist,cr3ative/chartist-js,gionkunz/chartist-js,chartist-js/chartist,hansmaad/chartist-js