Support and test on python 3.8

.gitlab-ci.yml

@@ -1,7 +1,7 @@
 # This file is a template, and might need editing before it works on your project.
 # Official language image. Look for the different tagged releases at:
 # https://hub.docker.com/r/library/python/tags/
-image: python:3.6
+image: python:3.8
 
 # Change pip's cache directory to be inside the project directory since we can
 # only cache local items.

setup.py

@@ -54,6 +54,7 @@ setup(
         'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: Implementation :: CPython',
         'Topic :: Communications',
         'Topic :: Internet',