NEWS: add v3.2.8
+etcd v3.2.8 (2017-09-29)
+- fix v2 client failover to next endpoint on mutable operation
+- fix grpcproxy to respect 'KeysOnly' flag
+
etcd v3.2.7 (2017-09-01)
- fix server-side auth so concurrent auth operations do not return old revision error
- fix concurrency/stm Put with serializable snapshot
