add types to union
add types to union

kroepke/graphql-java,fderose/graphql-java,BenjaminMalley/graphql-java,erikogenvik/graphql-java,hannesj/graphql-java,ChiralBehaviors/graphql-java,dminkovsky/graphql-java,graphql-java/graphql-java,blevandowski-lv/graphql-java,fderose/graphql-java,blevandowski-lv/graphql-java,dminkovsky/graphql-java,graphql-java/graphql-java