Remove hardcoding for current week

bot.go

 		return err
 	}
 
-	currentWeek := 2
+	_, currentWeek := time.Now().ISOWeek()
 	numberReg, _ := regexp.Compile("\\d+")
 	for _, section := range sections {
 		weekStr := numberReg.FindString(section.title)
 		if weekStr != "" {
 			weekNumber, _ := strconv.Atoi(weekStr)
+			if weekNumber < currentWeek-1 {
+				continue
+			}
 			if weekNumber > currentWeek {
 				break
 			}