Gauge property for a Billboard.js chart
Arguments
- bb
- A - billboard- htmlwidgetobject.
- ...
- See https://naver.github.io/billboard.js/release/latest/doc/Options.html#.gauge 
Examples
billboarder() %>% 
  bb_gaugechart(value = 50) %>% 
  bb_gauge(min = 0, max = 200, units = "km/h", width = 10,
           label = list(format = htmlwidgets::JS("function(value) {return value;}")))