lint: add review dog (#4652)

* lint: add review dog

- golangci is being deprecated on the 15th

Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>

types/validator_set_test.go

@@ -3,7 +3,6 @@ package types
 import (
 	"bytes"
 	"fmt"
-	"github.com/stretchr/testify/require"
 	"math"
 	"sort"
 	"strings"
@@ -12,6 +11,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/tendermint/tendermint/crypto"
 	"github.com/tendermint/tendermint/crypto/ed25519"