Revert "upgrade to go 1.16"

This reverts commit 05ee490.

analyze/dir.go

@@ -1,6 +1,7 @@
 package analyze
 
 import (
+	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -84,10 +85,9 @@ func (a *ParallelAnalyzer) processDir(path string) *File {
 		err       error
 		mutex     sync.Mutex
 		totalSize int64
-		info      os.FileInfo
 	)
 
-	files, err := os.ReadDir(path)
+	files, err := ioutil.ReadDir(path)
 	if err != nil {
 		log.Print(err.Error())
 	}
@@ -121,17 +121,17 @@ func (a *ParallelAnalyzer) processDir(path string) *File {
 				a.wait.Done()
 			}()
 		} else {
-			info, _ = f.Info()
 			file = &File{
 				Name:      f.Name(),
-				Flag:      getFlag(info),
-				Size:      info.Size(),
+				Flag:      getFlag(f),
+				Size:      f.Size(),
 				ItemCount: 1,
 				Parent:    &dir,
 			}
-			setPlatformSpecificAttrs(file, info)
 
-			totalSize += info.Size()
+			setPlatformSpecificAttrs(file, f)
+
+			totalSize += f.Size()
 
 			mutex.Lock()
 			dir.Files = append(dir.Files, file)

go.mod

@@ -1,6 +1,6 @@
 module github.com/dundee/gdu/v4
 
-go 1.16
+go 1.15
 
 require (
 	github.com/fatih/color v1.10.0

internal/testdir/test_dir.go

@@ -1,14 +1,15 @@
 package testdir
 
 import (
+	"io/ioutil"
 	"os"
 )
 
 // CreateTestDir creates test dir structure
 func CreateTestDir() func() {
 	os.MkdirAll("test_dir/nested/subnested", os.ModePerm)
-	os.WriteFile("test_dir/nested/subnested/file", []byte("hello"), 0644)
-	os.WriteFile("test_dir/nested/file2", []byte("go"), 0644)
+	ioutil.WriteFile("test_dir/nested/subnested/file", []byte("hello"), 0644)
+	ioutil.WriteFile("test_dir/nested/file2", []byte("go"), 0644)
 	return func() {
 		err := os.RemoveAll("test_dir")
 		if err != nil {