update readme

Author: macrozone

README.md

@@ -340,7 +340,7 @@ const Cursor3D = withProjectedPosition()(({positionProjected, projectionResult})
 
 ```
 
-It's recommended that you specify a transition duration (0.1s works nice), as the position gets updated rapidly, but slightly throttled. 
+It's recommended that you specify a transition duration (0.1s works nice), as the position gets updated rapidly, but slightly throttled.
 
 Now you can use your 3D cursor like this:
 
@@ -370,6 +370,8 @@ If you don't have the id, but want to place the cursor on a certain plane (e.g.
 
 ```
 
+You can also add a property `onProjectedPosition` to your cursor which will be called with the hit result on every frame
+
 It uses https://developer.apple.com/documentation/arkit/arframe/2875718-hittest with some default options. Please file an issue or send a PR if you need more control over the options here!
 
 ##### Attach to a given 3D object

package.json

@@ -4,7 +4,7 @@
     "type": "git",
     "url": "https://github.com/HippoAR/react-native-arkit.git"
   },
-  "version": "0.4.0",
+  "version": "0.4.1",
   "description": "React Native binding for iOS ARKit",
   "author": "Zehao Li <qft.gtr@gmail.com>",
   "license": "MIT",