input: Write a function to return an array with the running total of numbers in a given list using the numpy library. The function should take a list as input and return a numpy array with the cumulative sums of the elements.
  assert np.array_equal(runningTotal([1, 2, 3, 4]), np.array([1, 3, 6, 10]))
  assert np.array_equal(runningTotal([5, 5, 5, 5]), np.array([5, 10, 15, 20]))
  assert np.array_equal(runningTotal([0, 0, 0, 0]), np.array([0, 0, 0, 0]))
  assert np.array_equal(runningTotal([-1, -2, -3, -4]), np.array([-1, -3, -6, -10]))
  assert np.array_equal(runningTotal([]), np.array([]))
output: import numpy as np
  
  def runningTotal(lst):
      return np.cumsum(lst)