URLHeadBear.py: Change connection check URL

Changed URL that checks if client is connected to the internet or not
from Google's IP address 216.58.218.174
to DNS IP owned by Cloudfare 1.1.1.1

Fixes coala#2833

bears/general/URLHeadBear.py

@@ -69,8 +69,8 @@ class URLHeadBear(LocalBear):
     LICENSE = 'AGPL-3.0'
     CAN_DETECT = {'Documentation'}
 
-    # IP Address of www.google.com
-    check_connection_url = 'http://216.58.218.174'
+    # DNS IP by Cloudfare
+    check_connection_url = 'http://1.1.1.1/'
 
     @classmethod
     def check_prerequisites(cls):

tests/general/URLHeadBearTest.py

@@ -15,7 +15,8 @@ class URLHeadBearTestPrerequisites(unittest.TestCase):
     def test_check_prerequisites(self):
         with requests_mock.Mocker() as m:
             m.add_matcher(custom_matcher)
-            self.assertEqual(URLHeadBear.check_prerequisites(),
+            self.assertTrue(URLHeadBear.check_prerequisites())
+            self.assertNotEqual(URLHeadBear.check_prerequisites(),
                              'You are not connected to the internet.')
 
             m.head(URLHeadBear.check_connection_url,