title: Cannot clone gitlab project, Authentication failed
body: <p>I get the following error when I try and clone a project:</p>
  
  <blockquote>
    <p>Command: git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks ls-remote <a href="https://xxx.git" rel="nofollow noreferrer">https://xxx.git</a>
    Output: 
    Error: remote: HTTP Basic: Access denied
    remote: You must use a personal access token with 'read_repository' or 'write_repository' scope for Git over HTTP.
    remote: You can generate one at <a href="https://gitlab.com/profile/personal_access_tokens" rel="nofollow noreferrer">https://gitlab.com/profile/personal_access_tokens</a>
    fatal: Authentication failed for 'xxx.git/'</p>
  </blockquote>
  
  <p>I have generated a .pub using <code>ssh-keygen -t xxx -C "xxx"</code></p>
  
  <p>How can I clone the repo in <code>sourcetree</code>?</p>