add golangci-lint linter (#5499)

plugin/loadbalance/loadbalance_test.go

@@ -91,7 +91,6 @@ func TestLoadBalance(t *testing.T) {
 		if err != nil {
 			t.Errorf("Test %d: Expected no error, but got %s", i, err)
 			continue
-
 		}
 
 		cname, address, mx, sorted := countRecords(rec.Msg.Answer)

plugin/loadbalance/setup.go

@@ -35,7 +35,6 @@ func parse(c *caddy.Controller) error {
 		case 1:
 			if args[0] != "round_robin" {
 				return fmt.Errorf("unknown policy: %s", args[0])
-
 			}
 			return nil
 		}