Update changelog for efs v0.1.2
Update changelog for efs v0.1.2

childsb/external-storage,humblec/external-storage,childsb/external-storage,kubernetes-incubator/external-storage,childsb/external-storage,kubernetes-incubator/external-storage,humblec/external-storage,kubernetes-incubator/external-storage,humblec/external-storage