input: Write a function that crawls a given website for a specific type of data. The function should take a website URL and the data to crawl as input and return the found data. In this case, the function should extract phone numbers from the website's content.
  
  assert crawl_website_for_phone_numbers('www.example.com')==['123-456-7890', '987-654-3210']
output: def crawl_website_for_phone_numbers(url):
      import re
      import requests
      from bs4 import BeautifulSoup
      
      response = requests.get(url)
      soup = BeautifulSoup(response.content, 'html.parser')
      text = soup.get_text()
      
      phone_pattern = re.compile(r'\b\d{3}-\d{3}-\d{4}\b')
      phone_numbers = phone_pattern.findall(text)
      
      return phone_numbers