NEWS: add v3.1.4, v3.1.5
+etcd v3.1.5 (2017-03-27)
+- add '/etc/nsswitch.conf' file to alpine-based Docker image
+- fix raft memory leak issue
+- fix Windows file path issues
+
+etcd v3.1.4 (2017-03-22)
+
etcd v3.1.3 (2017-03-10)
- use machine default host when advertise URLs are default
values(localhost:2379,2380) AND if listen URL is 0.0.0.0
