By Andrew Holleran It hasn’t been a great offseason for the Dallas Cowboys. The NFC East franchise traded Pro Bowl wide receiver Amari Cooper to the Cleveland Browns and lost pass rusher Randy Gregory in embarrassing fashion to the Denver Broncos. Dallas has made some free agency moves, like adding wide receiver James Washington and pass rusher Dante Fowler, but a significant portion of the fan base is frustrated. In fact, one Cowboys fan has announced he will be rooting for a new team moving forward. Seriously. An announcement from a Dallas Cowboys fan is going viral on social media amid the …