title: Slack WebAPI fails with not_authed
body: <p>I'm attempting to post interactive messages to slack as a Bot User (using chat.postMessage, etc).</p>
  
  <p>Although I am passing in the Bot Access Token (as received from the initial OAuth) I keep getting an error response stating "not_authed".</p>
  
  <p>I get the same when I attempt auth.test.</p>
  
  <p>I'm doing something like the following with "request" in node.js:</p>
  
  <pre><code>app.get("/testAuth/test", function(req,res){
      console.log("in testAuth/test...sending test message to Slack");
  
      var bToken = process.env.TESTBOT_ACCESS_TOKEN;
      var slackMessageURL = "https://slack.com/api/auth.test";
      var postOptions = {
          uri: slackMessageURL,
          method: "POST",
          token: bToken
      };
      request(postOptions, (error, response, body) =&gt; {
          if(error){
              console.log("OOPPPPS....we hit an error in auth.test: " + error);
          } else {
              console.log("auth.test response: " + JSON.stringify(response));
          }
      });
      res.send("Sent Test...check logs"); 
  });
  </code></pre>
  
  <p>which results with:</p>
  
  <pre><code>auth.test response: {"statusCode":200,"body":"{\"ok\":false,\"error\":\"not_authed\"}",...
  </code></pre>
  
  <p>According to the Slack WebAPI docs, if I'm posting as the Bot, I should use the Bot's access token (as received from the initial oauth), but figure I'm either formatting my request incorrectly, or the token is not what Slack is expecting.</p>