Add support for Python 3.10

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-18.04, windows-2019, macos-10.15]
-        python-version: [3.6, 3.7, 3.8, 3.9, pypy3]
+        python-version: [3.6, 3.7, 3.8, 3.9, 3.10-dev, pypy3]
         exclude:
           - os: windows-2019
             python-version: pypy3

Makefile

@@ -13,7 +13,7 @@ clean-test-env:
 	@rm -rf test-env
 
 standalone-test: import-cldr test-env
-	@test-env/bin/py.test tests
+	@test-env/bin/pytest tests
 
 clean: clean-cldr clean-pyc clean-test-env
 

setup.py

@@ -45,10 +45,12 @@ def run(self):
         'Operating System :: OS Independent',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
+        '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',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Software Development :: Libraries :: Python Modules',

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{36,37,38,39}
+    py{36,37,38,39,310}
     pypy3
 
 [testenv]
@@ -23,3 +23,4 @@ python =
     3.7: py37
     3.8: py38
     3.9: py39
+    3.10-dev: py310