Add changelog entry for upcoming 0.15.0 release
Add changelog entry for upcoming 0.15.0 release

jenmalloy/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,jenmalloy/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,jenmalloy/enmasse,jenmalloy/enmasse,jenmalloy/enmasse,jenmalloy/enmasse,jenmalloy/enmasse