Message 281392 - Python tracker

The text looks okay. I’m not sure about putting it in the “Porting to Python 3.6” section, but there doesn’t seem to be a more appropriate existing heading. Perhaps we need a new heading, say “Other Improvement”, near “Optimizations” and “Build and C API Changes”. A previous What’s New had <https://docs.python.org/3.4/whatsnew/3.4.html#other-improvements>.