macOS/Windows: Update setuptools

[mayeut]

Update setuptools on macOS/Windows
Not required on linux since the manylinux image is updated frequently

It might help with the issue seen in #63

[mayeut]

travis-ci build failing on linux. c.f. #67

[YannickJadoul]

#67 is merged, so builds should work after rebasing.

But which one should be merged? This one and #68 seem to be addressing the same issue, or did I fail to notice anything?

[YannickJadoul]

OK, I just read #70 and realized that this update is still necessary on 3.4 and 3.5, so let's merge them both.

[mayeut]

@YannickJadoul

This PR address your comment in #63 (comment) but unfortunately, as shown in #70, It won't help for the issue in #63 (I thought it might by misreading changelog of python 3.4 & 3.5 where openSSL is shipped with the installer, but the 32bit only 10.5 installer, not the 10.6+ 32/64 bits installer)

=> This PR won't fix anything, however, macOS & Windows now have a behavior that more closely match the one from manylinux images which are updated frequently.

The only PR that can help #70 is the #68 which updates 2.7 installer from 2.7.14 to 2.7.15 (but that will only fix 2.7 build, not 3.4 or 3.5 builds)

[YannickJadoul]

@mayeut Sorry, I think I was confusing this with the other one from some time ago, #58 and #57.