Remove more references to 3.6

[wbarnha]

Remove other references to Python 3.6

[codecov-commenter]

Codecov Report

Base: 94.35% // Head: 94.31% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (04f0c3c) compared to base (c0a4571).
Patch has no changes to coverable lines.

❗ Current head 04f0c3c differs from pull request most recent head 70aa8a3. Consider uploading reports for the commit 70aa8a3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #369      +/-   ##
==========================================
- Coverage   94.35%   94.31%   -0.04%     
==========================================
  Files         100      100              
  Lines       10915    10914       -1     
  Branches     1531     1491      -40     
==========================================
- Hits        10299    10294       -5     
- Misses        537      539       +2     
- Partials       79       81       +2     

Impacted Files	Coverage Δ
faust/models/typing.py	94.36% <0.00%> (-0.94%)	⬇️
faust/livecheck/patches/aiohttp.py	100.00% <0.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.