chore(package): update ember-modal-dialog to version 0.8.4
chore(package): update ember-modal-dialog to version 0.8.4

https://greenkeeper.io/
dartajax/frontend,dartajax/frontend,gboushey/frontend,stopfstedt/frontend,gboushey/frontend,ilios/frontend,thecoolestguy/frontend,djvoa12/frontend,ilios/frontend,jrjohnson/frontend,gabycampagna/frontend,gabycampagna/frontend,thecoolestguy/frontend,jrjohnson/frontend,stopfstedt/frontend,djvoa12/frontend