input: Write a python function to convert a list of integers to their binary representation.
  assert list_to_binary([3, 8, 6]) == ['0b11', '0b1000', '0b110']
  assert list_to_binary([0, 1, 2]) == ['0b0', '0b1', '0b10']
  assert list_to_binary([10, 15, 255]) == ['0b1010', '0b1111', '0b11111111']
output: def list_to_binary(lst):
      return [bin(num) for num in lst]