Officially support Python 3.10 (#66)

* testing for Python 3.10

* added flake8 checks for python version comparisons

* added classifiers for supported versions

Author: maxfischer2781

.github/workflows/unittests.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', 'pypy-3.6', 'pypy-3.7']
+        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', 'pypy-3.6', 'pypy-3.7']
 
     steps:
     - uses: actions/checkout@v2

asyncstdlib/_typing.py

@@ -7,7 +7,7 @@
 import sys
 from typing import TypeVar, Hashable, Union, AsyncIterable, Iterable, Callable
 
-if sys.version_info[:2] >= (3, 8):
+if sys.version_info >= (3, 8):
     from typing import Protocol, AsyncContextManager, ContextManager, TypedDict
 else:
     from typing_extensions import (

pyproject.toml

@@ -15,6 +15,11 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.6",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
 ]
 requires-python = "~=3.6"
 requires = ["typing_extensions; python_version<'3.8'"]
@@ -27,6 +32,7 @@ test = [
     "black; implementation_name=='cpython'",
     "coverage",
     "pytest-cov",
+    "flake8-2020",
     "mypy; implementation_name=='cpython'",
 ]
 doc = ["sphinx", "sphinxcontrib-trio"]