Mark support for python 3.9 (#153)

Author: bl-ue

.github/workflows/test.yml

@@ -2,17 +2,17 @@ name: Test
 
 on:
   push:
-    branches: [ '*' ]
+    branches: ['*']
   pull_request:
-    branches: [ '*' ]
+    branches: ['*']
 
 jobs:
   build:
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        python-version: ['3.5', '3.6', '3.7', '3.8', 'pypy3']
+        python-version: ['3.5', '3.6', '3.7', '3.8', '3.9', 'pypy3']
 
     steps:
     - uses: actions/checkout@v2

setup.py

@@ -46,6 +46,7 @@
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Topic :: Utilities",
         "Topic :: System"
     ]