- Add error return value for functions: `AddChart()`, `AddComment()`, `AddPicture()`, `AddShape()`, `AddTable()` and `SetConditionalFormat()`

- go test has been updated

1 files changed, 1 insertions, 1 deletions

diff --git a/lib.go b/lib.go
index a168781..fc95b23 100644
--- a/lib.go
+++ b/lib.go
@@ -50,7 +50,7 @@ func readFile(file *zip.File) []byte {
 		log.Fatal(err)
 	}
 	buff := bytes.NewBuffer(nil)
-	io.Copy(buff, rc)
+	_, _ = io.Copy(buff, rc)
 	rc.Close()
 	return buff.Bytes()
 }