title: Change default colors set on Angular ngx-charts
body: <p>I'm working on an angular app and using ngx-charts, after debugging and searching online for few moments I couldn't find how to change the color palette on the charts. </p>
  
  <p>The default angular color palette looks like the following: 
  <a href="https://i.stack.imgur.com/TLLAO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TLLAO.png" alt="enter image description here"></a></p>
  
  <p>Do you guys know how to change the color palette on the ngx-charts? </p>
  
  <p>Any help is much appreciated, thank you! </p>