Telegram bot messenger

package main

import (
    "bufio"
    "fmt"
    "io"
    "log"
    "os"

    tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api"
)

func main() {
    input := getStdin()
    bot := setupTg()

    //log.Printf("Authorized on account %s", bot.Self.UserName)

    var myChatID int64
    myChatID = chat-id-here
    msg := tgbotapi.NewMessage(myChatID, input)
    bot.Send(msg)
}

func setupTg() *tgbotapi.BotAPI {
    bot, err := tgbotapi.NewBotAPI(bot:key-here)
    if err != nil {
        log.Panic(err)
    }
    bot.Debug = false
    return bot
}

func getStdin() string {
    info, err := os.Stdin.Stat()
    if err != nil {
        panic(err)
    }

    if info.Mode()&os.ModeNamedPipe == 0 {
        fmt.Println("The command is intended to work with pipes.")
        fmt.Println("Usage: echo 'text' | telegramBot")
        os.Exit(0)
    }

    reader := bufio.NewReader(os.Stdin)
    var output []rune

    for {
        input, _, err := reader.ReadRune()
        if err != nil && err == io.EOF {
            break
        }
        output = append(output, input)
    }

    return string(output)
}