BLD: Try adding 3.8 support.

Author: Scott Sanderson

.github/workflows/ci.yaml

@@ -43,6 +43,8 @@ jobs:
             python-version: 3.6
           - name: py37
             python-version: 3.7
+          - name: py38
+            python-version: 3.8
 
     steps:
       - name: Dump Matrix Config

setup.py

@@ -40,8 +40,10 @@ def install_requires():
         'License :: OSI Approved :: Apache Software License',
         'Natural Language :: English',
         'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Topic :: Software Development :: Pre-processors',
     ],
     url='https://github.com/ssanderson/interface',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=py{27,35,36,37}
+envlist=py{27,35,36,37,38}
 skip_missing_interpreters=true
 
 [pep8]