title: How to add SSH Key in Travis CI?
body: <p>In Travis Doc there is tab "SSH Key" in Settings, but not in my account. I need to add SSH Key to clone submodules on GitHub.</p>
  
  <p>My Account:</p>
  
  <p><img src="https://i.stack.imgur.com/tSRFi.png" alt="enter image description here"></p>
  
  <p>Travis Doc:</p>
  
  <p><img src="https://i.stack.imgur.com/ZBA23.png" alt="enter image description here"></p>