input: Write a python function to remove negative numbers from a list.
  assert removeNegatives([1, -2, 3, -4, 5]) == [1, 3, 5]
  assert removeNegatives([-1, -2, -3, 0, 4]) == [0, 4]
  assert removeNegatives([10, -10, 20, -20, 30]) == [10, 20, 30]
output: def removeNegatives(lst):
      return [x for x in lst if x >= 0]