title: How to login to Heroku within only one line?
body: <p>I'd like to know if there is a way to give credentials directly in login command in Heroku CLI ?</p>
  
  <p>For now i'm doing like this : </p>
  
  <pre><code>heroku login
  email : xxxx (user input)
  password : xxxx (user input)
  </code></pre>
  
  <p>And I'd like to be able to do something in one line just like this :</p>
  
  <pre><code>heroku login email password
  </code></pre>
  
  <p>I searched in the documentation but didn't find anything.</p>