title: GitHub: invalid username or password
body: <p>I have a project hosted on GitHub. I fail when trying to push my modifications on the master. I always get the following error message</p>
  
  <pre><code>Password for 'https://git@github.com': 
  remote: Invalid username or password.
  fatal: Authentication failed for 'https://git@github.com/eurydyce/MDANSE.git/'
  </code></pre>
  
  <p>However, setting my ssh key to github seems ok. Indeed, when I do a <code>ssh -T git@github.com</code> I get</p>
  
  <pre><code>Hi eurydyce! You've successfully authenticated, but GitHub does not provide shell access.
  </code></pre>
  
  <p>Which seems to indicate that everything is OK from that side (eurydyce being my github username). I strictly followed the instructions given on github and the recommendations of many stack discussion but no way. Would you have any idea of what I may have done wrong?</p>