Log Message:
python36: update to 3.6.3

Python 3.6.3 final
Library
* bpo-31641: Re-allow arbitrary iterables in concurrent.futures.as_completed(). \ 
Fixes regression in 3.6.3rc1.

Build
* bpo-31662: Fix typos in Windows uploadrelease.bat script. Fix Windows Doc \ 
build issues in Doc/make.bat.
* bpo-31423: Fix building the PDF documentation with newer versions of Sphinx.

More here https://docs.python.org/3.6/whatsnew/changelog.html