Go 1.16 and later required, migration of deprecation package `ioutil`

- Improving performance for stream writer `SetRow` function,  reduces memory usage over and speedup about 19%
- Update dependencies module
- Update GitHub workflow

1 files changed, 1 insertions, 2 deletions

diff --git a/sheet.go b/sheet.go
index 71123d7..ecd39f0 100644
--- a/sheet.go
+++ b/sheet.go
@@ -17,7 +17,6 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path"
@@ -479,7 +478,7 @@ func (f *File) SetSheetBackground(sheet, picture string) error {
 	if !ok {
 		return ErrImgExt
 	}
-	file, _ := ioutil.ReadFile(filepath.Clean(picture))
+	file, _ := os.ReadFile(filepath.Clean(picture))
 	name := f.addMedia(file, ext)
 	sheetXMLPath, _ := f.getSheetXMLPath(sheet)
 	sheetRels := "xl/worksheets/_rels/" + strings.TrimPrefix(sheetXMLPath, "xl/worksheets/") + ".rels"