Fix inconsistent test name

rules_test.go

@@ -143,7 +143,7 @@ func TestRuleGteLte(t *testing.T) {
 	check(t, fail5, 1)
 }
 
-func TestLenMinMax(t *testing.T) {
+func TestRuleLenMinMax(t *testing.T) {
 	type s struct {
 		A string         `validate:"len=3"`
 		B []int          `validate:"min=2"`