updated changelog for release v3.0.0-beta7
updated changelog for release v3.0.0-beta7

ilios/ilios,thecoolestguy/ilios,Trott/ilios,justinchu17/ilios,stopfstedt/ilios,justinchu17/ilios,justinchu17/ilios,stopfstedt/ilios,dartajax/ilios,Trott/ilios,dartajax/ilios,ilios/ilios,thecoolestguy/ilios,justinchu17/ilios