add 3.9 testing

Author: tomato42

.travis.yml

@@ -40,6 +40,10 @@ jobs:
       dist: xenial
       sudo: true
       env: TACKPY=false
+    - python: 3.9
+      dist: xenial
+      sudo: true
+      env: TACKPY=false
     - python: 2.7
       env: TACKPY=true
     - python: 3.4

setup.py

@@ -40,6 +40,7 @@
             'Programming Language :: Python :: 3.6',
             'Programming Language :: Python :: 3.7',
             'Programming Language :: Python :: 3.8',
+            'Programming Language :: Python :: 3.9',
             'Topic :: Security :: Cryptography',
             'Topic :: Software Development :: Libraries :: Python Modules',
             'Topic :: System :: Networking'