package/python-requests: update project homepage

http://www.python-requests.org/ is dead, the project lives on
https://requests.readthedocs.io/ now.

Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 15996bc4ffed232b238d825351244aeeb31babbd)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

package/python-requests/Config.in

@@ -10,4 +10,4 @@ config BR2_PACKAGE_PYTHON_REQUESTS
 	  Requests is an Apache2 Licensed HTTP library, written in
 	  Python, for human beings.
 
-	  http://www.python-requests.org/
+	  https://requests.readthedocs.io