Opportunity Attacks: Only make melee attack roll or use special feats?

@JeremyECrawford Opportunity Attacks: Only make melee attack roll or use special feats (ex: Great Weapon Master -5 to hit, +10 dam)?

— Sean Bonney (@seanbonney) August 14, 2016

Opportunity attacks benefit from features that affect melee attacks (not ones tied to the Attack action). #DnD https://t.co/9F9Fe7FjXk

— Jeremy Crawford (@JeremyECrawford) August 15, 2016