remove ioutil

It is deprecated.

node.go

@@ -6,7 +6,7 @@ package notify
 
 import (
 	"errors"
-	"io/ioutil"
+	"io/fs"
 	"os"
 	"path/filepath"
 )
@@ -78,12 +78,12 @@ Traverse:
 		}
 		// TODO(rjeczalik): tolerate open failures - add failed names to
 		// AddDirError and notify users which names are not added to the tree.
-		fi, err := ioutil.ReadDir(nd.Name)
+		fi, err := os.ReadDir(nd.Name)
 		if err != nil {
 			return err
 		}
 		for _, fi := range fi {
-			if fi.Mode()&(os.ModeSymlink|os.ModeDir) == os.ModeDir {
+			if fi.Type()&(fs.ModeSymlink|fs.ModeDir) == fs.ModeDir {
 				name := filepath.Join(nd.Name, fi.Name())
 				stack = append(stack, nd.addchild(name, name[len(nd.Name)+1:]))
 			}

notify_test.go

@@ -9,7 +9,6 @@ package notify
 
 import (
 	"errors"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -162,7 +161,7 @@ func TestRecreated(t *testing.T) {
 		time.Sleep(100 * time.Millisecond)
 
 		// Create a file
-		mustT(t, ioutil.WriteFile(file, []byte("abc"), 0666))
+		mustT(t, os.WriteFile(file, []byte("abc"), 0666))
 	}
 	timeout := time.After(5 * time.Second)
 	checkCreated := func() {

testing_test.go

@@ -7,7 +7,6 @@ package notify
 import (
 	"bufio"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"reflect"
@@ -105,7 +104,7 @@ func tmptree(root, list string) (string, error) {
 	}
 	defer f.Close()
 	if root == "" {
-		if root, err = ioutil.TempDir(vfs()); err != nil {
+		if root, err = os.MkdirTemp(vfs()); err != nil {
 			return "", err
 		}
 	}

util_unix_test.go

@@ -8,14 +8,13 @@
 package notify
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
 )
 
 func tmpfile(s string) (string, error) {
-	f, err := ioutil.TempFile(filepath.Split(s))
+	f, err := os.CreateTemp(filepath.Split(s))
 	if err != nil {
 		return "", err
 	}
@@ -96,7 +95,7 @@ func TestCanonicalCircular(t *testing.T) {
 
 // issue #83
 func TestCanonical_RelativeSymlink(t *testing.T) {
-	dir, err := ioutil.TempDir(wd, "")
+	dir, err := os.MkdirTemp(wd, "")
 	if err != nil {
 		t.Fatalf("TempDir()=%v", err)
 	}