Release date for 0.15.0
Release date for 0.15.0

eduNEXT/edx-sga,eduNEXT/edx-sga,eduNEXT/edx-sga,eduNEXT/edx-sga,mitodl/edx-sga,eduNEXT/edx-sga,mitodl/edx-sga,mitodl/edx-sga,mitodl/edx-sga,mitodl/edx-sga