input: Write a python function to scrape emails from a given URL.
  assert scrape_emails('http://example.com') == ['info@example.com', 'contact@example.com']
  assert scrape_emails('http://anotherexample.com') == ['admin@anotherexample.com', 'support@anotherexample.com']
  assert scrape_emails('http://noemails.com') == []
output: import re
  import requests
  from bs4 import BeautifulSoup
  
  def scrape_emails(url):
      response = requests.get(url)
      soup = BeautifulSoup(response.text, 'html.parser')
      text = soup.get_text()
      emails = re.findall(r'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}', text)
      return list(set(emails))