VOL-1921 - updated to use go mod

Change-Id: I8d5187fa91fa619494f972bc29d3bd61e5be3a82
diff --git a/vendor/go.etcd.io/etcd/raft/storage.go b/vendor/go.etcd.io/etcd/raft/storage.go
index 14ad686..6be5745 100644
--- a/vendor/go.etcd.io/etcd/raft/storage.go
+++ b/vendor/go.etcd.io/etcd/raft/storage.go
@@ -44,6 +44,8 @@
 // become inoperable and refuse to participate in elections; the
 // application is responsible for cleanup and recovery in this case.
 type Storage interface {
+	// TODO(tbg): split this into two interfaces, LogStorage and StateStorage.
+
 	// InitialState returns the saved HardState and ConfState information.
 	InitialState() (pb.HardState, pb.ConfState, error)
 	// Entries returns a slice of log entries in the range [lo,hi).