input: Write a python function to generate a sequence of numbers between a given start and end.
  assert sequence_generator(1, 5) == [1, 2, 3, 4, 5]
  assert sequence_generator(10, 15) == [10, 11, 12, 13, 14, 15]
  assert sequence_generator(0, 0) == [0]
output: def sequence_generator(start, end):
      return list(range(start, end + 1))