drop support py36 and py37

[shimizukawa]

Feature or Bugfix

• Feature

Purpose

• drop support py36 and py37

Relates

• https://code.djangoproject.com/ticket/32355

[codecov]

Codecov Report

Merging #75 (0530803) into master (5a417b2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #75   +/-   ##
=======================================
  Coverage   45.49%   45.49%           
=======================================
  Files           3        3           
  Lines         244      244           
  Branches       62       62           
=======================================
  Hits          111      111           
  Misses        123      123           
  Partials       10       10           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5a417b2...0530803. Read the comment docs.

[shimizukawa]

• Python-3.6 is suupported until 2021/12 https://www.python.org/dev/peps/pep-0494/#and-beyond-schedule
• Python-3.7 is suupported until 2023/06 https://www.python.org/dev/peps/pep-0537/#and-beyond-schedule
• Django-4.0 drop python-3.6 and 3.7 support that will be released Jan 2022 https://www.djangoproject.com/download/

Why is django-redsihft-backend discontinuing support? Let's rethink this as follows....

django-redshift-backend supports:

• Python-3.10 since 2021/10
• Python-3.6 until 2021/12
• Python-3.7 until 2023/06
• Django-2.2 until 2022/04
• Django-4.0 since 2022/01

[shimizukawa]

see #76