Version bump to 1.6.15
Version bump to 1.6.15

ActiveRDF/ActiveRDF,net7/ActiveRDF,net7/ActiveRDF,net7/ActiveRDF,ActiveRDF/ActiveRDF,ActiveRDF/ActiveRDF,net7/ActiveRDF,mauriciobomfim/ActiveRDF,mauriciobomfim/ActiveRDF,mauriciobomfim/ActiveRDF