title: Error when push commits with Github: fatal: could not read Username
body: <p>Since few time, I use Github for my projects and I have an issue when I want to push commits. </p>
  
  <p>To beginning, I have forked a repository. Then I have cloned the fork (with command line <code>git clone https://github.com/ ...</code>) and, after doing modifications, I have committed with success (<code>git commit -a</code>).</p>
  
  <p>After this, I have tried to push commits with command line <code>git push</code> but I obtain the following error:</p>
  
  <pre><code>fatal: could not read Username for 'https://github.com': No such file or directory
  </code></pre>
  
  <p>Have you got an idea to resolve this issue?</p>