title: Add bottom border of to tabs in Flutter
body: <p>What I'm trying to do is adding a bottom border of tabBar, so it will be under tabs title and above the indicatorColor and for both active and Inactive tabs, just like the attached image.</p>
  
  <p><strong>Red line is what I am trying to add, green line is the indicatorColor.</strong></p>
  
  <p><em>Note, usually I do this for appBar using 'bottom' but here bottom is reserved to the TabBar</em>.</p>
  
  <p>Is this possible?</p>
  
  <p>Thanks a lot</p>
  
  <p><a href="https://i.stack.imgur.com/ilCAm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ilCAm.png" alt="Flutter tabs screen"></a></p>