title: strikethrough Doesn't work on Telegram node js
body: <p>I'm using <a href="https://github.com/yagop/node-telegram-bot-api" rel="nofollow noreferrer"><code>&quot;node-telegram-bot-api&quot;: &quot;^0.50.0&quot;</code></a>
  And I want to use <a href="https://core.telegram.org/bots/api#formatting-options" rel="nofollow noreferrer">strikethrough</a></p>
  <pre><code>bot.sendPhoto(channel, url,{
          caption: '~d~ or ~~NO~~',
          parse_mode: 'Markdown',
      });
  </code></pre>
  <p>But the result in the chat is:
  ~d~ OR ~~NO~~ instead if strikethrough text</p>
  <p>Bold and italic work properly</p>