title: positionClass: 'toast-bottom-right' is not working in angular
body: <p>positionClass: 'toast-bottom-right' is not override the default positionClass: 'toast-top-right' class and the code are follows,</p>
  
  <p>'this.toastr.success('Your Screen as Set to Default[enter image description here][1] ', 'Success!',{dismiss : 'click', positionClass: 'toast-bottom-right'});'</p>
  
  <p>'<a href="https://i.stack.imgur.com/NTbCV.png" rel="nofollow noreferrer">https://i.stack.imgur.com/NTbCV.png</a>'</p>
  
  <p>the position of the toastr is not changed it shows the top right corner.</p>