input: Write a python function to send a GET request to 'https://reqres.in/api/users' and return the response text.
  assert get_users() is not None
  assert 'data' in get_users()
  assert isinstance(get_users(), str)
output: import requests
  
  def get_users():
      response = requests.get('https://reqres.in/api/users')
      return response.text