Update the URL for the requests package (GH-17006)



Change the url from docs.python-requests.org to requests.readthedocs.io
diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index a903d60..03712c1 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -18,7 +18,7 @@
 
 .. seealso::
 
-    The `Requests package <http://docs.python-requests.org/>`_
+    The `Requests package <https://requests.readthedocs.io/en/master/>`_
     is recommended for a higher-level HTTP client interface.