add python3.8 to environment

.travis.yml

@@ -1,11 +1,12 @@
-dist: trusty
+dist: xenial
 sudo: false
 language: python
 
 python:
-  - "3.4"
   - "3.5"
   - "3.6"
+  - "3.7"
+  - "3.8"
   - "nightly"
 matrix:
   allow_failures:

setup.py

@@ -32,6 +32,7 @@ setup(
         'Operating System :: Microsoft :: Windows',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Topic :: Communications',
         'Topic :: Internet'
     ],

tox.ini

@@ -7,6 +7,7 @@ ignore =
 envlist =
     py36,
     py37,
+    py38,
     coverage,
     flake8,
     check-manifest