adopt latest golang enhancements (#91)

pkg/es/snapshot.go

@@ -66,13 +66,13 @@ func SnapshotList(conf *cfg.Config) error {
 	snapshots := []*Snapshot{} // original snapshot names
 
 	for _, snapshot := range sres {
-		snap := &Snapshot{
+		snap := new(Snapshot{
 			Name:     *snapshot.Id,
 			Status:   *snapshot.Status,
 			Start:    fmt.Sprintf("%s", snapshot.StartTime),
 			Forindex: indexFromSnapshot(*snapshot.Id),
 			Orphaned: "no",
-		}
+		})
 
 		_, exists := indicies[snap.Forindex]
 		if !exists {