[Feature Request] Drop-lowest/highest

[pcinderflame]

Put simply, a command to support D&D-related common dice rolls, such as

• Ability Score Generation, (4d6, drop lowest die)
• Advantage (2d20 drop lowest die)
• Disadvantage (2d20 drop highest die)

[RyanRobotnik]

You could use the notation d6-L, d6-H

That is the commonly accepted notation: https://en.wikipedia.org/wiki/Dice_notation