public static Retrofit2ConverterFactory create() {
        return create(new FastJsonConfig());
    }
Fastjson for Retrofit Converter Json Factory.
<p>
Compatible fastjson 1.2.x

@author ligboy, wenshao
@author Victor.Zxy
@see Converter.Factory
@since 2.0.2
fastjson1-compatible/src/main/java/com/alibaba/fastjson/support/retrofit/Retrofit2ConverterFactory.java