Update proguard-rules.pro

Author: MillerAdulu

android/app/proguard-rules.pro

@@ -1,3 +1,6 @@
 -keep class com.google.j2objc.annotations.** { *; }
 -keep class com.google.common.collect.ImmutableSet { *; }
 -keep class com.google.common.collect.ImmutableMap { *; }
+-keep class com.google.j2objc.annotations.RetainedWith { *; }
+-keepclassmembers class com.google.common.collect.ImmutableSet { *; }
+-keepclassmembers class com.google.common.collect.ImmutableMap { *; }