input: Write a python function to generate a histogram using matplotlib.
  assert generate_histogram([1, 2, 2, 3, 3, 3, 4, 4, 4, 4]) == None
  assert generate_histogram([5, 5, 5, 5, 5, 5, 5, 5, 5, 5]) == None
  assert generate_histogram([1, 2, 3, 4, 5]) == None
output: def generate_histogram(data):
      import matplotlib.pyplot as plt
      
      plt.hist(data, bins='auto', alpha=0.7, rwidth=0.85)
      plt.xlabel('Value')
      plt.ylabel('Frequency')
      plt.title('Histogram')
      plt.grid(axis='y', alpha=0.75)
      plt.show()