update to new (timestamp & empty structs) encoding in amino

- timestamps no longer have fixed length encoding
-

types/proto3_test.go

@@ -62,10 +62,6 @@ func TestProto3Compatibility(t *testing.T) {
 		Height:  150,
 		Time:    &proto3.Timestamp{Seconds: seconds, Nanos: nanos},
 		NumTxs:  7,
-		// TODO(ismail): as Jae suggested, we'll add a flag to make this obsolete:
-		LastBlockID: &proto3.BlockID{
-			PartsHeader: &proto3.PartSetHeader{},
-		},
 		TotalTxs:       100,
 		LastCommitHash: []byte("commit hash"),
 		DataHash:       []byte("data hash"),
@@ -93,6 +89,9 @@ func TestProto3Compatibility(t *testing.T) {
 	pb, err = proto.Marshal(&proto3.Header{})
 	assert.NoError(t, err, "unexpected error")
 	t.Log(pb)
+	ab, err = cdc.MarshalBinaryBare(Header{})
+	assert.NoError(t, err, "unexpected error")
+	t.Log(ab)
 
 	pb, err = proto.Marshal(&proto3.Timestamp{})
 	assert.NoError(t, err, "unexpected error")