title: R geojson feature display with leaflet
body: <p>I have a GeoJSON map that is rendering fine with leaflet and open street map tile from Rstudio IDE locally, however the map doesn't display the features and properties (embeded in the jeojson file) when clicked in the various regions of the map.  When hosting the file on github, github automatically picks it up and respond to the clicks - as seen on the figure.  Looked for the information in the help documents for R and couldn't find any information.</p>
  
  <p><a href="https://i.stack.imgur.com/YfYOc.png" rel="nofollow"><img src="https://i.stack.imgur.com/YfYOc.png" alt="enter image description here"></a></p>
  
  <pre><code>leaflet() %&gt;% 
          addProviderTiles("Hydda.Full")  %&gt;% 
          setView(lng = -77.03687, lat = 38.90719, zoom = 12) %&gt;% 
          addGeoJSON(topoData, weight = 4, color = "red",fill = TRUE)
  </code></pre>