title: Property 'includes' does not exist on type 'string[]'
body: <p>Getting the error </p>
  
  <blockquote>
    <p>Property 'includes' does not exist on type 'string[]'</p>
  </blockquote>
  
  <p>in node_modules/ng2-breadcrumb/app/components/breadcrumbService.ts
  I am trying to implement breadcrumb functionality in an angular2 app.</p>