Update dice and d20 to be more efficient

lorebot/lorebot.go

@@ -306,11 +306,8 @@ func rollhandler(rtm *slack.RTM, ev *slack.MessageEvent) {
 
 func dicerollhandler(rtm *slack.RTM, ev *slack.MessageEvent) {
 	//fmt.Print(rand.Intn(100))
-	dice := []int{1, 2, 3, 4, 5, 6}
 	rand.Seed(time.Now().UnixNano())
-	rndStr := fmt.Sprintf("%d", dice[rand.Intn(len(dice)-1)])
-
-	rtm.SendMessage(rtm.NewOutgoingMessage(rndStr, ev.Channel))
+	rtm.SendMessage(rtm.NewOutgoingMessage(fmt.Sprintf("%d", rand.Intn(6)+1), ev.Channel))
 }
 
 func rrhandler(rtm *slack.RTM, ev *slack.MessageEvent) {
@@ -324,11 +321,8 @@ func rrhandler(rtm *slack.RTM, ev *slack.MessageEvent) {
 
 func d20handler(rtm *slack.RTM, ev *slack.MessageEvent) {
 	//fmt.Print(rand.Intn(100))
-	dice := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}
 	rand.Seed(time.Now().UnixNano())
-	rndStr := fmt.Sprintf("%d", dice[rand.Intn(len(dice)-1)])
-
-	rtm.SendMessage(rtm.NewOutgoingMessage(rndStr, ev.Channel))
+	rtm.SendMessage(rtm.NewOutgoingMessage(fmt.Sprintf("%d", rand.Intn(20)+1), ev.Channel))
 }
 
 func depricatedrnghandler(rtm *slack.RTM, ev *slack.MessageEvent, redisClient *redis.Client) {