Update Readme.md re: new react-native version

react-native now uses `getPackages()` to return an array of package objects instead of overriding `onCreate()`.

README.md

@@ -42,6 +42,8 @@ dependencies {
 
 * register module (in MainActivity.java)
  
+  * For react-native below 0.19.0 (use `cat ./node_modules/react-native/package.json | grep version`)
+
 ```java
 import com.rnfs.RNFSPackage;  // <--- import
 
@@ -74,6 +76,21 @@ public class MainActivity extends Activity implements DefaultHardwareBackBtnHand
 }
 ```
 
+  * For react-native 0.19.0 and higher
+```java
+import com.rnfs.RNFSPackage; // <------- add package
+
+public class MainActivity extends ReactActivity {
+   // ...
+    @Override
+    protected List<ReactPackage> getPackages() {
+      return Arrays.<ReactPackage>asList(
+        new MainReactPackage(), // <---- add comma
+        new RNFSPackage() // <---------- add package
+      );
+    }
+```
+
 ## Examples
 
 ### Basic