title: Space between gpplot2 horizontal legend elements
body: <p>I have a ggplot2 plot as follows:</p>
  
  <pre><code>library(ggplot2)
  
  ggplot(mtcars, aes(factor(cyl), fill=factor(cyl))) + 
      geom_bar() +
      coord_flip() +
      theme(legend.position = 'top') +
      guides(fill = guide_legend(title=NULL))
  </code></pre>
  
  <p>I'd like add spacing between the fill elements as follows:</p>
  
  <p><a href="https://i.stack.imgur.com/SJsPX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/SJsPX.png" alt="enter image description here"></a></p>