Die Rolls

Create the Dierolls class with the following behavior:
>>> rolls = Dierolls(2)
>>> rolls.numDice
2
>>> rolls.roll()
9
>>> rolls.roll()
6
>>> rolls.roll()
9
>>> rolls.roll()
6
>>> rolls.roll()
8
>>> rolls.roll()
6
>>> rolls.roll()
12
>>> rolls.roll()
6
>>> rolls.roll()
12
>>> rolls.roll()
7
>>> rolls.roll()
5
>>> rolls.roll()
3
>>> rolls.rollsOf(12)
2
>>> rolls.rollsOf(9)
2
>>> rolls.rollsOf(6)
4
>>> rolls.rollsOf(11)
0