title: R: `geojson_read()` read UTF-8 file on Windows results in weird characters in `@data` slot
body: <p>When I download some open data using download.file, I can see that æ, ø and å are encoded correctly when I open the temp.geojson-file.</p>
  
  <pre><code>url &lt;- "http://wfs-kbhkort.kk.dk/k101/ows?service=WFS&amp;version=1.0.0&amp;request=GetFeature&amp;typeName=k101:p_pladser&amp;outputFormat=json&amp;SRSNAME=EPSG:4326"
  download.file(url, destfile = "temp.geojson")
  </code></pre>
  
  <p>However, when I import it, the æ, ø and å turn into weird characters.</p>
  
  <pre><code>library(geojsonio)
  p_pladser &lt;- geojson_read(x = "temp.geojson", what = "sp")
  p_pladser &lt;- geojson_read(x = "temp.geojson", what = "sp", encoding = "ISO-8859-1")
  p_pladser &lt;- geojson_read(x = "temp.geojson", what = "sp", encoding = "latin-1")
  p_pladser &lt;- geojson_read(x = "temp.geojson", what = "sp", encoding = "UTF-1")
  </code></pre>
  
  <p>I don't understand where the encoding goes wrong? When downloading the data into a file, shouldn't I be able to define the encoding I want myself?</p>
  
  <p>How do i get the characters to show correctly in R, as they are in the <code>temp.geojson</code> file?</p>
  
  <p>Note: I'm using Windows 10.</p>