unable to set x axis limits for histogram

I have a dataset that has a range of 30 to 99 and I would like to force the x axis to run from 0 to 100

However, the code below produces a chart that starts at ~30 in shiny / shinydashboard

Is there something I'm missing?

Thanks

output$histo_demo<-renderMetricsgraphics({

  dfz<-data.frame(x=c(30,30,90,96,99,45))

  mjs_plot(dfz, x) %>%
    mjs_histogram(bins=20) %>%
    mjs_labs(y_label="Count ") %>%  
    mjs_axis_x(min_x=0, max_x=100)
})

session info:

R version 3.1.2 (2014-10-31)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C         LC_TIME=C            LC_COLLATE=C         LC_MONETARY=C        LC_MESSAGES=C        LC_PAPER=C           LC_NAME=C           
 [9] LC_ADDRESS=C         LC_TELEPHONE=C       LC_MEASUREMENT=C     LC_IDENTIFICATION=C 

attached base packages:
[1] tcltk     stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] uuid_0.1-1            DT_0.0.39             xts_0.9-7             zoo_1.7-12            dygraphs_0.4.3        magrittr_1.5          scales_0.2.4          reshape2_1.4         
 [9] ggplot2_1.0.0         plyr_1.8.1            rjson_0.2.15          metricsgraphics_0.8.5 htmlwidgets_0.3.3     rCharts_0.4.5         RJDBC_0.2-4           rJava_0.9-6          
[17] lubridate_1.3.3       sqldf_0.4-10          RSQLite_1.0.0         DBI_0.3.1             gsubfn_0.6-6          proto_0.3-10          shinyBS_0.61          shinydashboard_0.2.3 
[25] shiny_0.11.1.9004    

loaded via a namespace (and not attached):
 [1] MASS_7.3-35      R6_2.0.1         RJSONIO_1.3-0    Rcpp_0.11.3      chron_2.3-45     colorspace_1.2-4 digest_0.6.4     grid_3.1.2       gtable_0.1.2     htmltools_0.2.6 
[11] httpuv_1.3.2     lattice_0.20-29  memoise_0.2.1    mime_0.3         munsell_0.4.2    stringr_0.6.2    tools_3.1.2      whisker_0.3-2    xtable_1.7-4     yaml_2.1.13

hrbrmstr / metricsgraphics

unable to set x axis limits for histogram #29