title: missing_scope error when trying to fetch channel history with bot token
body: <p>When doing the following with Slacks Bolt framework:</p>
  
  <pre><code>app.client.conversations.history({
        token: token,
        channel: channelId,
        latest: messageId,
        count: 1
      })
  </code></pre>
  
  <p>I'm getting <code>Error: An API error occurred: missing_scope</code>. </p>
  
  <p>I'm passing a Bot token (Which the docs indicated is supported <a href="https://api.slack.com/methods/conversations.history" rel="nofollow noreferrer">https://api.slack.com/methods/conversations.history</a>) and have already added <code>channels.history</code> and <code>channels.read</code> scopes to my oAuth and permission scope so I'm a little suck.</p>
  
  <p>Has anyone come across this before?</p>