Error for Python 3.6 nightly

[hackebrot]

Hi,

our cookiecutter build breaks for Python 3.6 nightly due to some error in pytest-mock.

    class MockFixture(object):
TypeError: '_SentinelObject' object is not callable

Figured I'll raise this here although it's certainly not a problem at this point as Python 3.6 isn't out just yet.

[nicoddemus]

Thanks! 👍

[hackebrot]

Always 😄

[mikenerone]

Though 3.6 is still alpha, I'd like to add a "pretty please." Many projects are wanting to prep for it, and "py36" is being added to tox.ini's everywhere. :)

[nicoddemus]

Thanks for the ping! I will take a look ASAP. We should have a release soon anyway, this would be another nice addition. 😁