deprecate TurfAssertions.getCoord() instead of removing it (#825)

Author: osana

services-turf/src/main/java/com/mapbox/turf/TurfAssertions.java

@@ -4,6 +4,7 @@
 import com.mapbox.geojson.FeatureCollection;
 import com.mapbox.geojson.GeoJson;
 import com.mapbox.core.utils.TextUtils;
+import com.mapbox.geojson.Point;
 
 /**
  * Also called Assertions, these methods enforce expectations of a certain type or calculate various
@@ -18,6 +19,20 @@ private TurfAssertions() {
     // Private constructor preventing initialization of this class
   }
 
+  /**
+   * Unwrap a coordinate {@link Point} from a Feature with a Point geometry.
+   *
+   * @param obj any value
+   * @return a coordinate
+   * @see <a href="http://turfjs.org/docs/#getcoord">Turf getCoord documentation</a>
+   * @since 1.2.0
+   * @deprecated use {@link TurfMeta#getCoord(Feature)}
+   */
+  @Deprecated
+  public static Point getCoord(Feature obj) {
+    return TurfMeta.getCoord(obj);
+  }
+
   /**
    * Enforce expectations about types of GeoJson objects for Turf.
    *