input: Write a python function to find the maximum value from a JSON response of a given URL.
  ```python
  assert find_max_value('https://example.com/api') == 100  # assuming 100 is the max value in the response
  assert find_max_value('https://example.com/api2') == 200  # assuming 200 is the max value in the response
  assert find_max_value('https://example.com/api3') == 300  # assuming 300 is the max value in the response
output: import requests
  
  def find_max_value(url):
      response = requests.get(url)
      data = response.json()
      return max(data.values())