Fixes python 3.6 issue

[HeardACat]

What this PR does / why we need it:

This PR address errors which working in Python 3.6 local mode
I have tested briefly on Python 3.8 (Ubuntu 20.04)

Which issue(s) this PR fixes:

Fixes #1502
I have tested against Python 3.8 on Ubuntu as well.

Does this PR introduce a user-facing change?:

NONE 

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: chappers
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[feast-ci-bot]

Hi @chappers. Thanks for your PR.

I'm waiting for a feast-dev member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[woop]

/ok-to-test

[woop]

/kind bug

[tsotnet]

@chappers Thank you for submitting a PR. The issue here is that we do not support Python 3.6. You need to be on Python 3.7+ to use Feast. Unfortunately our setup.py does not reflect that, but we'll update it.

[Joostrothweiler]

@tsotnet could you maybe elaborate on the reasons for not supporting Python 3.6?