python-requests: update URL

The old 2.python-requests.org URL is not reachable on modern browsers,
and is not the current canonical URL for the project.  Update to the
current best URL for the project.

Signed-off-by: Karl Palsson <karlp@etactica.com>

lang/python/python-requests/Makefile

@@ -28,7 +28,7 @@ define Package/python3-requests
   SECTION:=lang
   CATEGORY:=Languages
   TITLE:=HTTP library for Python
-  URL:=https://2.python-requests.org/
+  URL:=https://requests.readthedocs.io
   DEPENDS:= \
 	  +python3-light  \
 	  +python3-chardet  \