public ArmeriaRetrofitBuilder addConverterFactory(Converter.Factory factory) {
        retrofitBuilder.addConverterFactory(requireNonNull(factory, "factory"));
        return this;
    }
Adds the specified converter factory for serialization and deserialization of objects.
@see Retrofit.Builder#addConverterFactory(Converter.Factory)
retrofit2/src/main/java/com/linecorp/armeria/client/retrofit2/ArmeriaRetrofitBuilder.java