Given a number and a hash with min and max properties, return true if the number lies within the given range (inclusive).
is_in_range(4, { min: 0, max: 5 }) ➞ true
is_in_range(4, { min: 4, max: 5 }) ➞ true
is_in_range(4, { min: 6, max: 10 }) ➞ false
is_in_range(5, { min: 5, max: 5 }) ➞ truemin <= max is always true.