input: Write a function to crawl a website and extract phone numbers. The function should take the website URL as input and return a list of phone numbers found on the website. Use the following regular expression pattern to match phone numbers: `\d{3}-\d{3}-\d{4}`.
  
  assert crawl_website_for_phone_numbers('www.example.com')==['123-456-7890', '987-654-3210']
  assert crawl_website_for_phone_numbers('www.anotherwebsite.com')==[]
  assert crawl_website_for_phone_numbers('www.fakewebsite.com')==['555-555-5555']
output: import re
  import requests
  from bs4 import BeautifulSoup
  
  def crawl_website_for_phone_numbers(url):
      response = requests.get(url)
      soup = BeautifulSoup(response.text, 'html.parser')
      text = soup.get_text()
      phone_numbers = re.findall(r'\d{3}-\d{3}-\d{4}', text)
      return phone_numbers