title: Getting rid of unnecessary lines (axes?) in Choroplethr
body: <p>Whenever I make a choropleth using the Choroplethr package, these unnecessary lines appear. I believe they're axes, but the state_choropleth function shouldn't be printing axes.</p>
  <p>Example:</p>
  <pre><code>df &lt;- data.frame(region = c(&quot;alabama&quot;, &quot;alaska&quot;, &quot;arizona&quot;, &quot;arkansas&quot;, &quot;california&quot;, &quot;colorado&quot;, &quot;connecticut&quot;, &quot;delaware&quot;, &quot;district of columbia&quot;, &quot;florida&quot;, &quot;georgia&quot;, &quot;hawaii&quot;, &quot;idaho&quot;, &quot;illinois&quot;, &quot;indiana&quot;, &quot;iowa&quot;, &quot;kansas&quot;, &quot;kentucky&quot;, &quot;louisiana&quot;, &quot;maine&quot;, &quot;maryland&quot;, &quot;massachusetts&quot;, &quot;michigan&quot;, &quot;minnesota&quot;, &quot;mississippi&quot;, &quot;missouri&quot;, &quot;montana&quot;, &quot;nebraska&quot;, &quot;nevada&quot;, &quot;new hampshire&quot;, &quot;new jersey&quot;, &quot;new mexico&quot;, &quot;new york&quot;, &quot;north carolina&quot;, &quot;north dakota&quot;, &quot;ohio&quot;, &quot;oklahoma&quot;, &quot;oregon&quot;, &quot;pennsylvania&quot;, &quot;rhode island&quot;, &quot;south carolina&quot;, &quot;south dakota&quot;, &quot;tennessee&quot;, &quot;texas&quot;, &quot;utah&quot;, &quot;vermont&quot;, &quot;virginia&quot;, &quot;washington&quot;, &quot;west virginia&quot;, &quot;wisconsin&quot;, &quot;wyoming&quot;), value = runif(51))
  state_choropleth(df)
  </code></pre>
  <p>This is the result:
  <a href="https://i.stack.imgur.com/y2xmM.png" rel="nofollow noreferrer">Map with extraneous lines</a></p>
  <p>Can anyone help me get rid of these? I've poked around in the Choroplethr source code but can't seem to identify what these are.</p>
  <p>Edit: I'm running Windows 10 Enterprise, R 3.4.2 64-bit, and have installed choroplethr 3.6.1 and ggplot2 2.2.1.</p>