input: Write a python function to fetch JSON data from a given URL and return it.
  assert fetch_json_data('http://example.com') == {'example_key': 'example_value'}
  assert fetch_json_data('http://another-example.com') == {'another_key': 'another_value'}
  assert fetch_json_data('http://yet-another-example.com') == {'yet_another_key': 'yet_another_value'}
output: import requests
  
  def fetch_json_data(url):
      response = requests.get(url)
      return response.json()