Update README.rdoc
Update README.rdoc

Add gemnasium dependency status.
Talkdesk/databasedotcom,kcg5033/databasedotcom,phongleland/databasedotcom-kb_articles,makepositive/DatabaseDotCom,sld/databasedotcom,mintotsai/databasedotcom,heroku/databasedotcom,amoose/databasedotcom-gem,pngarland/databasedotcom-fork,jthurst01/databasedotcom,xively/databasedotcom,sjauld/databasedotcom