fill in elementReaderType in return type
fill in elementReaderType in return type

dwrensha/capnproto-java,nchinmay/capnproto-java,jen20/capnproto-java,dwrensha/capnproto-java,jen20/capnproto-java,dwrensha/capnproto-java,nchinmay/capnproto-java,jen20/capnproto-java,nchinmay/capnproto-java