public RuntimeTypeAdapterFactory<T> registerSubtype(Class<? extends T> type) {
    return registerSubtype(type, type.getSimpleName());
  }
Registers {@code type} identified by its {@link Class#getSimpleName simple name}. Labels are
case sensitive.

@throws IllegalArgumentException if either {@code type} or its simple name have already been
    registered on this type adapter.
db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/serializer/gson/RuntimeTypeAdapterFactory.java