Support Python 3.10

[di]

Fixes #145.

[grant]

Curious, how did you calculate this?

I am still developing my python knowledge.

[leorochael]

I don't know how @di calculated it, but looking at the git blame for the setup.py file of the Sanic project, it's possible to see that Python 3.6 support was removed from Sanic on 2021 Feb 21.

That same commit adds the following line to the project README:

Minimum Python version is 3.7. If you need Python 3.6 support, please use v20.12LTS.

As of the time of this pull request, sanic==20.12.4 was the latest in the v20.12 line. Other micro versions have since been released in that LTS line, the latest as of today being sanic==20.12.6.

I suppose this means that an alternative would be to specify instead this line as:

Suggested change

	sanic<=20.12.4; python_version <= '3.6'
	sanic~=20.12; python_version <= '3.6'

[leorochael]

What else is missing before merging this branch and making a new release based on it?

I was considering including this library in a Python 3.10 project I'm working on.

[leorochael]

I don't know how @di calculated it, but looking at the git blame for the setup.py file of the Sanic project, it's possible to see that Python 3.6 support was removed from Sanic on 2021 Feb 21.

That same commit adds the following line to the project README:

Minimum Python version is 3.7. If you need Python 3.6 support, please use v20.12LTS.

As of the time of this pull request, sanic==20.12.4 was the latest in the v20.12 line. Other micro versions have since been released in that LTS line, the latest as of today being sanic==20.12.6.

I suppose this means that an alternative would be to specify instead this line as:

Suggested change

	sanic<=20.12.4; python_version <= '3.6'
	sanic~=20.12; python_version <= '3.6'