(TrendHunter.com) Grubhub announced a promotion for this year's Amazon Prime day whereby the food delivery application will be giving away a free year of Grubhub+, the application's premium subscription... (TrendHunter.com) Grubhub announced a promotion for this year's Amazon Prime day whereby the food delivery application will be giving away a free year of Grubhub+, the application's premium subscription...