Build vim with Python 3.6 support

[vim]

Build vim with Python 3.6 support

[k-takata]

We can update the python version by changing the line, however Bram still uses Python 3.5 in his official build as we can see it in bigvim.bat. I think it's better to keep the nightly builds in sync with bigvim.bat.
(Oh, Bram has been already updated Racket to 6.10. I think we should follow it.)

As it is written in #31, using Python 3.6 might be possible by doing :set pythonthreedll=python36.dll, but it is not tested at all.

[chrisbra]

should be possible, just changing this line:

vim-win32-installer/appveyor.bat

Line 33 in 3c9caed

set PYTHON3_VER=35

to

set PYTHON3_VER=36

[branchus]

Thank you for your quick response and instruction. I didn't make it clear. I mean is it possible that your build of Vim to support Python 3.6 in the near future? Thanks

[branchus]

I see
Thank you very much :)