update proguard rules

Author: kit2o

android/app/proguard-rules.pro

@@ -21,5 +21,13 @@
     private final ** mBundleLoader;
 }
 
+-keepclassmembers class com.facebook.react.runtime.ReactHostImpl {
+    private final ** mReactHostDelegate;
+}
+
+-keep interface com.facebook.react.runtime.ReactHostDelegate { *; }
+
+-keep class * implements com.facebook.react.runtime.ReactHostDelegate { *; }
+
 # Can't find referenced class org.bouncycastle.**
 -dontwarn com.nimbusds.jose.**