Support Python 3.9

Author: Cito

.travis.yml

@@ -6,6 +6,11 @@ matrix:
       python: 3.8
       dist: xenial
       sudo: true
+    - name: Unit tests with Python 3.9
+      env: TOXENV=py39
+      python: 3.9
+      dist: xenial
+      sudo: true
     - name: Unit tests with Python 3.8
       env: TOXENV=py38
       python: 3.8

pyproject.toml

@@ -21,7 +21,8 @@ classifiers = [
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8"
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9"
 ]
 packages = [
     { include = "graphql_relay", from = "src" },

setup.py

@@ -27,6 +27,7 @@
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],
     install_requires=[

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{36,37,38}, black, flake8, mypy, manifest
+envlist = py{36,37,38,39}, black, flake8, mypy, manifest
 
 [testenv:black]
 basepython = python3.8