bot.command('start', ctx => {
  let startMessage = `start message`;
  bot.telegram.sendMessage(ctx.chat.id, startMessage,
    {
      reply_markup: {
        inline_keyboard: [
          [
            { text: "botão", callback_data: 'clique' }
          ]
        ]
      },
      parse_mode: "markdown"
    }
    )
  })

bot.action('clique', ctx => {
    let editedMessage = `edited message`;
    ctx.telegram.editMessageText(ctx.chat.id, ctx.message.message_id, undefined, editedMessage,
      {
        reply_markup: {
          inline_keyboard: [
            [
              { text: "⬅️ Voltar", callback_data: 'start' }
            ]
          ]
        },
        parse_mode: "markdown"
      })
  })