replace deprecated ioutil

agenda/agenda.go

@@ -4,7 +4,6 @@ import (
 	"crypto/md5"
 	"encoding/hex"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 	"time"
@@ -17,7 +16,7 @@ var fileFormats = []string{"mp3", "m4a", "webm"}
 
 // New attempts to load an agenda from the given filename
 func New(filename string) (*Agenda, error) {
-	data, err := ioutil.ReadFile(filename)
+	data, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read agenda from file: %w", err)
 	}