Declare support for Python 3.9 (#2942)

Author: D3X

.github/workflows/run-tests.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
         os: [ubuntu-latest, macOS-latest, windows-latest ]
 
     steps:

setup.py

@@ -6,8 +6,7 @@
 import os
 import re
 
-from setuptools import setup, find_packages
-
+from setuptools import find_packages, setup
 
 ROOT = os.path.dirname(__file__)
 VERSION_RE = re.compile(r'''__version__ = ['"]([0-9.]+)['"]''')
@@ -54,6 +53,7 @@ def get_version():
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
     ],
     project_urls={
         'Documentation': 'https://boto3.amazonaws.com/v1/documentation/api/latest/index.html',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py36,py37,py38
+envlist = py36,py37,py38,py39
 
 # Comment to build sdist and install into virtualenv
 # This is helpful to test installation but takes extra time