Print NA states

[mkiang]

Addresses #14 but I haven't tested it very thoroughly and requires the user to specify an NA label, but it might be preferable to do it another way...

[hrbrmstr]

#ty! I'll take a look at it (likely in the early AM tomorrow). Could you also update the DESCRIPTION file and add yourself as a contributor?

[mkiang]

Sure. I updated to try to match your style guide and added myself to the DESCRIPTION but given the minor nature of the edit, I'm happy with an uncredited PR. Thanks for the package — hoping to use it on a publicly-available conference presentation this month.

[mkiang]

Realized I didn't modify the geom. Did so and here is some sample code to make sure it works:

library(statebins)
library(dplyr)
library(ggplot2)
data(USArrests)

USArrests$state <- rownames(USArrests)
USArrests$Assault[1:4] <- NA

statebins(USArrests, value_col="Assault", name = "Assault", round=TRUE) +
    theme_statebins(legend_position="right")

ggplot(USArrests, aes(state = state, fill = Assault)) + 
    geom_statebins() + 
    theme_statebins(legend_position="right") + 
    coord_equal()