title: error message "unable to get local issuer certificate" when cloning a project from github to RStudio
body: <p>I was trying to clone a github's repo from RStudio. I have configured git as version control executable.</p>
  
  <p>I got this error message:</p>
  
  <p>SSL certificate problem: unable to get local issuer certificate.</p>
  
  <p>What do I have to do?</p>
  
  <p>Thanks</p>