input: Write a python function to find the maximum value in a dictionary.
  assert find_max_value({"a": 10, "b": 20, "c": 30})==30
  assert find_max_value({"x": 5, "y": 15, "z": 25})==25
  assert find_max_value({"k1": 100, "k2": 200, "k3": 50})==200
output: def find_max_value(d):
      return max(d.values())