title: About the heroku, how to disable SSL verification, error message "WARNING: Unable to verify SSL certificate for api.heroku.com"
body: <p>everyone,
  first of all, i have googled yet for this question, and took a ticket in official website,
  but still solve this problem,
  looking the error message, please,</p>
  
  <pre><code>~$ heroku keys:add
  Uploading ssh public key /home/my_dir_name/.ssh/id_rsa.pub
  Enter your Heroku credentials.
  Email: example@email.com
  Password: 
  WARNING: Unable to verify SSL certificate for api.heroku.com
  To disable SSL verification, run with HEROKU_SSL_VERIFY=disable
  </code></pre>
  
  <p>I have append the "HEROKU_SSL_VERIFY=disable" to ~/.bashrc, but it not works.
  My version of heroku is 2.3.6, 
  thanks a lot.</p>