Remove @OverRide

this will make compatible with react native 0.47+ and prevents build errors when using 
"react-native link react-native-document-scanner" as you describe on readme.

Author: blntylmn

android/src/main/java/com/reactlibrary/RNPdfScannerPackage.java

@@ -16,7 +16,6 @@ public List<NativeModule> createNativeModules(ReactApplicationContext reactConte
       return Arrays.<NativeModule>asList(new RNPdfScannerModule(reactContext));
     }
 
-    @Override
     public List<Class<? extends JavaScriptModule>> createJSModules() {
       return Collections.emptyList();
     }
@@ -25,4 +24,4 @@ public List<Class<? extends JavaScriptModule>> createJSModules() {
     public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
       return Collections.emptyList();
     }
-}
+}