title: Individual color for bootstrap vue progress
body: <p>Is there any possibility to change the color of a progress bar to any value specified in <code>hex</code>? </p>
  
  <p>The colors of variants (e.g. 'success', 'danger') are not fulfilling our specs so I need to specify my own color for the progress like this: <code>#01A688</code>.</p>
  
  <p>I already tried to manage via <code>css</code> but without success.</p>
  
  <p>Thanks for your help in advance.</p>