getUseDeveloperSupport is now public

A breaking change made `getUseDeveloperSupport` public facebook/react-native#11329

README.md

@@ -73,7 +73,7 @@ public class MainApplication extends Application implements ReactApplication {
 
     private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
         @Override
-        protected boolean getUseDeveloperSupport() {
+        public boolean getUseDeveloperSupport() {
             return BuildConfig.DEBUG;
         }