April Fools' Day is a minefield of fake announcements and pranks, but Dunkin’ is offering some much-needed digital sincerity (and generosity) this year. For the second year in a row, Dunkin’ is giving away an enormous number of free coffees to celebrate April Fools' Day. How many, we hear you ask. Last year, Dunkin' promised to give away a million free coffees, but a lot of people thought it was a prank. In an effort to prove how serious they are about this special occasion, Dunkin' is going one better and giving away 1,000,001 free coffees this year. View this post on Instagram Rewards members simply need to open the Dunkin’ app and enter the promo code STILLNOTAJOKE to qualify for this promotion. The giveaway is valid while supplies last and excludes extra-large and cold brew coffees. Not already a member? Don't worry, it's free to join. The free coffee redemption is valid in your app for seven days, so you don't actually need to leave the house today.…