input: Write a python function to generate a list of numbers within a specified range.
  assert generate_range_list(5, 11)==[5, 6, 7, 8, 9, 10]
  assert generate_range_list(1, 5)==[1, 2, 3, 4]
  assert generate_range_list(0, 3)==[0, 1, 2]
output: def generate_range_list(start, end):
      return list(range(start, end))