Update README.md

README.md

@@ -1,9 +1,18 @@
 # 3d-tiles-renderer-js
 
+_IN PROGRESS_
+
 In progress three.js implementation of the [3D Tiles format](https://github.com/AnalyticalGraphicsInc/3d-tiles/blob/master/specification/).
 
 The renderer supports a limited subset of the spec for the moment. See [Issue #15](https://github.com/NASA-AMMOS/3DTilesRendererJS/issues/15) for information on which features are not yet implemented. 
 
+**In Progress Features**
+- Multicamera support
+- Fast raycast support
+- Travis integration
+- ThreeTilesRenderer API
+- Performance
+
 # Use
 
 ```js
@@ -26,6 +35,12 @@ group : Group
 displayBounds = false : Boolean
 ```
 
+### .loadSiblings
+
+```js
+loadSiblings = true : Boolean
+```
+
 ### .constructor
 
 ```js