Swift Striker (5e Feat)
From D&D Wiki
Prerequisites: Dexterity 13 or higher
When you take the Attack action on your turn while not wielding a weapon with the heavy or two handed property, the number of attacks you can make increases by one. You don't add your ability modifier to the damage of this additional attack. Additionally, if you use your Dash action, you may immediately make an attack, no further action necessary.