Add note that sfc_POINT is accepted for markers

Author: jcheng5

markers.Rmd

@@ -11,7 +11,7 @@ Use markers to call out points on the map. Marker locations are expressed in lat
 Point data for markers can come from a variety of sources:
 
 - `SpatialPoints` or `SpatialPointsDataFrame` objects (from the `sp` package)
-- `POINT` objects (from the `sf` package); only `X` and `Y` dimensions will be considered
+- `POINT`, `sfc_POINT`, and `sf` objects (from the `sf` package); only `X` and `Y` dimensions will be considered
 - Two-column numeric matrices (first column is longitude, second is latitude)
 - Data frame with latitude and logitude columns. You can explicitly tell the marker function which columns contain the coordinate data (e.g. `addMarkers(lng = ~Longitude, lat = ~Latitude)`), or let the function look for columns named `lat`/`latitude` and `lon`/`lng`/`long`/`longitude` (case insensitive).
 - Simply provide numeric vectors as `lng` and `lat` arguments

markers.html

@@ -210,7 +210,7 @@ <h3>Data sources</h3>
 <p>Point data for markers can come from a variety of sources:</p>
 <ul>
 <li><code>SpatialPoints</code> or <code>SpatialPointsDataFrame</code> objects (from the <code>sp</code> package)</li>
-<li><code>POINT</code> objects (from the <code>sf</code> package); only <code>X</code> and <code>Y</code> dimensions will be considered</li>
+<li><code>POINT</code>, <code>sfc_POINT</code>, and <code>sf</code> objects (from the <code>sf</code> package); only <code>X</code> and <code>Y</code> dimensions will be considered</li>
 <li>Two-column numeric matrices (first column is longitude, second is latitude)</li>
 <li>Data frame with latitude and logitude columns. You can explicitly tell the marker function which columns contain the coordinate data (e.g. <code>addMarkers(lng = ~Longitude, lat = ~Latitude)</code>), or let the function look for columns named <code>lat</code>/<code>latitude</code> and <code>lon</code>/<code>lng</code>/<code>long</code>/<code>longitude</code> (case insensitive).</li>
 <li>Simply provide numeric vectors as <code>lng</code> and <code>lat</code> arguments</li>