Update readme for v4.0.0 release
Update readme for v4.0.0 release

Azure/azure-mobile-apps-net-client,Azure/azure-mobile-apps-net-client,MatkovIvan/azure-mobile-apps-net-client,Azure/azure-mobile-apps-net-client,MatkovIvan/azure-mobile-apps-net-client,MatkovIvan/azure-mobile-apps-net-client