Fix floating point difference with Travis

spec/models/user_spec.rb

@@ -157,7 +157,8 @@ describe User do
       end
       @user.reload
       num_orders = Rails.application.config.frecency_num_orders
-      expect(@user.frecency).to eq(10025915)
+      # On Travis the result is 10025938 cause floating points
+      expect(@user.frecency).to be_within(50).of(10025915)
     end
   end
 end