use includes instead of deprecated contains
use includes instead of deprecated contains

ember-cli/ember-twiddle,Gaurav0/ember-twiddle,ember-cli/ember-twiddle,Gaurav0/ember-twiddle,Gaurav0/ember-twiddle,knownasilya/ember-twiddle,ember-cli/ember-twiddle,knownasilya/ember-twiddle,knownasilya/ember-twiddle