Link to https version of python docs

To which the http version permanently redirects

docs/conf.py

@@ -244,7 +244,7 @@ latex_additional_files = ['flaskstyle.sty', 'logo.pdf']
 #epub_tocdepth = 3
 
 intersphinx_mapping = {
-    'http://docs.python.org/dev': None,
+    'https://docs.python.org/dev': None,
     'http://werkzeug.pocoo.org/docs/': None,
     'http://www.sqlalchemy.org/docs/': None,
     'http://wtforms.simplecodes.com/docs/0.5/': None,