title: Bad projection when using plot_geo in R Plotly
body: <p>I try making maps using plotly, with plot_ly the result is great, but I found I should be using plot_geo, but can't manage to make it works.</p>
  <p>I work with a France map in Lambert93 :</p>
  <pre><code>library(plotly)
  
  download.file(&quot;https://www.data.gouv.fr/fr/datasets/r/087ab701-f21d-4046-b53e-8b647baf505d&quot;,&quot;dep.geojson&quot;)
  dep &lt;- sf::st_read(&quot;c:/users/sdaubree/Desktop/testplotly/101deps-lambert.geojson&quot;)
  </code></pre>
  <p>that plot correctly with plot_ly :</p>
  <pre><code>plot_ly(dep)
  </code></pre>
  <p>But not correctly with plot_geo :</p>
  <pre><code>plot_geo(dep)
  </code></pre>
  <p>As you can see, France is too wide this way.</p>
  <p>I tried to change the CRS, as plot_geo give me the following message :
  The trace types 'scattermapbox' and 'scattergeo' require a projected coordinate system that is based on the WGS84 datum (EPSG:4326), but the crs provided is: '+proj=lcc +lat_0=46.5 +lon_0=3 +lat_1=49 +lat_2=44 +x_0=700000 +y_0=6600000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs'. Attempting transformation to the target coordinate system.</p>
  <p>So I try to change the CRS myself :</p>
  <pre><code>dep84 &lt;- sf::st_transform(dep,sp::CRS(&quot;EPSG:4326&quot;))
  plot_geo(dep84)
  </code></pre>
  <p>But it changes nothing to the result : France is still flat.</p>