title: How to change HEAD of git submodule
body: <p>The Project is having one sub module and is pointing to one particular SHA (ex <code>62726c</code>) of that submodule.</p>
  
  <p>So each time on running <code>git submodule update --init</code> the submodule directory is showing the changes of that SHA (<code>62726c</code>) only.</p>
  
  <p>Recently I made change to the submodule and pushed the changes SHA (<code>f81611</code>) but as mentioned above the HEAD of the submodule is still pointing to old SHA <code>62726c</code> .</p>