input: Write a python function to create a RequestHandler class that handles GET and POST requests.
  assert isinstance(RequestHandler(), RequestHandler)
  assert RequestHandler().get('https://httpbin.org/get').status_code == 200
  assert RequestHandler().post('https://httpbin.org/post', data={'key':'value'}).status_code == 200
output: import requests
  
  class RequestHandler:
      def get(self, url):
          response = requests.get(url)
          return response
  
      def post(self, url, data=None, json=None):
          response = requests.post(url, data=data, json=json)
          return response