add setuptools version check for overall setup.py

[markberger]

Checks version of setuptools in the overall setup.py for unicode support similar to setup.py in dbt-core: https://github.com/fishtown-analytics/dbt/blob/dev/0.15.1/core/setup.py#L6

This addresses #1771

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[drewbanin]

Thanks for opening this PR @markberger! I just kicked off the tests here - let me know if you're able to sign the CLA and then we can get this merged for dbt v0.15.2 :D

[markberger]

Thanks Drew! I signed the CLA after opening this pr but it looks like the bot did not recognize that. Is there anything else I need to do?

[beckjake]

Looks great! It's unfortunate that we do a useless find_namespace_packages import, but I think it's better that all setup.py files test the version the same way.

[drewbanin]

@cla-bot check

Thanks @markberger - this will go out for v0.15.2 :D

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!