Fix XKCD command after new go-xkcd broke it.

commands.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"github.com/bwmarrin/discordgo"
 	"github.com/bwmarrin/disgord/x/mux"
@@ -103,12 +104,14 @@ func getXKCD(s *discordgo.Session, m *discordgo.Message, ctx *mux.Context) {
 	}
 	matchedNum, _ := regexp.MatchString(`[0-9]+`, arg)
 	if arg == "latest" {
-		comic, err = xkclient.Latest()
+		comic, err = xkclient.Latest(context.Background())
 	} else if matchedNum {
 		comicNum, _ := strconv.Atoi(arg)
-		comic, err = xkclient.Get(comicNum)
+		comic, err = xkclient.Get(context.Background(), comicNum)
 	} else {
-		comic, err = xkclient.Random()
+		latestcomic, _ := xkclient.Latest(context.Background())
+		randcomic := rand.Intn(latestcomic.Number)
+		comic, err = xkclient.Get(context.Background(), randcomic)
 	}
 	if err != nil {
 		resp = err.Error()