message: fix(docs): fix stackblitz link
diff: @@ -11,7 +11,7 @@ You can use one of starter templates:
  Plunkr: https://plnkr.co/edit/0NipkZrnckZZROAcnjzB?p=preview
  -StackBlitz: https://stackblitz.com/edit/ngx-bootstrap-stack?file=app%2Fapp.module.ts
  +StackBlitz: https://stackblitz.com/edit/ngx-bootstrap?file=app%2Fapp.module.ts
  ### Versions of ngx-bootstrap, Angular, and Bootstrap:
  