Returns a random integer between [n1] and [n2].
If only 1 number is passed, the other will be 0. If none are passed, the number will be either 0 or 1.
Number.random(50, 100) -> ex. 85 Number.random(50) -> ex. 27 Number.random() -> ex. 0
Lower bound, default = 0.
Uppder bound, default = 1.
number
Random number between [n1] and [n2].