updated changelog re: issue #28 fixed in r1471
updated changelog re: issue #28 fixed in r1471

ssssam/rdflib,RDFLib/rdflib,yingerj/rdflib,ssssam/rdflib,ssssam/rdflib,marma/rdflib,yingerj/rdflib,dbs/rdflib,armandobs14/rdflib,avorio/rdflib,avorio/rdflib,dbs/rdflib,dbs/rdflib,dbs/rdflib,yingerj/rdflib,RDFLib/rdflib,armandobs14/rdflib,RDFLib/rdflib,ssssam/rdflib,RDFLib/rdflib,avorio/rdflib,marma/rdflib,yingerj/rdflib,marma/rdflib,avorio/rdflib,armandobs14/rdflib,marma/rdflib,armandobs14/rdflib