Updating the README for the release of 3.4.2
Updating the README for the release of 3.4.2

okeefm/health-data-standards,PheMA/health-data-standards,PheMA/health-data-standards,projectcypress/health-data-standards,thecristen/health-data-standards,Xodarap/health-data-standards,okeefm/health-data-standards,Xodarap/health-data-standards,projectcypress/health-data-standards,thecristen/health-data-standards