title: How to fix missing scope error in Slack (rtm.connect) API?
body: <p>When I try to use the <code>rtm.connect</code> method with own token, tester returns me a false response. </p>
  
  <p>URL : <code>https://slack.com/api/rtm.connect?token=xoxp-532016xxxxx-53xxxxxx-536743xxxxxx-9211bedc4bfe9ddfexxxxxxxxxxxxxx&amp;pretty=1</code></p>
  
  <pre><code>{
      "ok": false,
      "error": "missing_scope",
      "needed": "rtm:stream",
      "provided": "identify,incoming-webhook,channels:history,im:history,channels:read,im:read,team:read,users:read,users:read.email,users.profile:read,chat:write:user,files:write:user"
  }
  </code></pre>
  
  <p>What am I missing in request? Why does this <code>missing_scope</code> error occur? I already followed the Slack documentation. </p>