input: Write a python function to detect malicious URLs using URL Observatory library.
  assert detect_malicious_url("http://example.com") == False
  assert detect_malicious_url("http://malicious-url.com") == True
  assert detect_malicious_url("http://safe-site.org") == False
output: def detect_malicious_url(url):
      from url_observatory import URLObservatory
  
      observatory = URLObservatory()
      result = observatory.scan(url)
      
      if result['malicious']:
          return True
      return False