title: Changing color of states in plot_usmap
body: <p>I would like to change the color of states with status 3 and 4 in this map to gray with darker lines (as if they were not included). Is that possible?</p>
  <pre><code>library(usmap)
  
  #data    
  state &lt;- datasets::state.name
      status &lt;- rep(1:4)
      map &lt;- cbind(state, status)
      map &lt;- as.data.frame(map)
      map
  
  
  #Map plot    
  mapus &lt;- plot_usmap(data = map, 
      values = &quot;status&quot;, color = &quot;white&quot;, 
      labels= TRUE, label_color = &quot;black&quot;) + 
      scale_fill_brewer(palette = &quot;Pastel1&quot;, na.translate= FALSE,name = &quot;X&quot;)+
      theme(legend.position = &quot;top&quot;) + ggtitle(&quot;X&quot;)
   
  </code></pre>