Add python 3.9 support

Author: mllemango

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     name: Python ${{ matrix.version }}
     strategy: 
       matrix:
-        version: [2.7, 3.6, 3.8]
+        version: [2.7, 3.6, 3.8, 3.9]
 
     steps: 
       - uses: actions/checkout@v2

README.md

@@ -10,9 +10,6 @@ The [Shopify Admin API](https://shopify.dev/docs/admin-api) Python Library
 ### Requirements
 You should be signed up as a partner on the [Shopify Partners Dashboard](https://partners.shopify.com) so that you can create and manage shopify applications.
 
-#### Python version
-This library requires Python 3.8 or lower.
-
 ### Installation
 
 To easily install or upgrade to the latest release, use [pip](http://www.pip-installer.org/).

setup.py

@@ -21,7 +21,7 @@
       scripts=['scripts/shopify_api.py'],
       license='MIT License',
       install_requires=[
-          'pyactiveresource>=2.2.0',
+          'pyactiveresource>=2.2.2',
           'PyYAML',
           'six',
       ],
@@ -41,6 +41,7 @@
                    'Programming Language :: Python :: 3.4',
                    'Programming Language :: Python :: 3.5',
                    'Programming Language :: Python :: 3.6',
+                   'Programming Language :: Python :: 3.9',
                    'Topic :: Software Development',
                    'Topic :: Software Development :: Libraries',
                    'Topic :: Software Development :: Libraries :: Python Modules']

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py34, py35, py36
+envlist = py27, py34, py35, py36, py39
 skip_missing_interpreters = true
 
 [testenv]