Add testing for Python 3.8 (#166)

Add testing for Python 3.8

Author: nicoddemus

.github/workflows/main.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ["2.7", "3.5", "3.6", "3.7"]
+        python: ["2.7", "3.5", "3.6", "3.7", "3.8"]
         os: [ubuntu-latest, windows-latest]
         include:
           - python: "2.7"
@@ -21,6 +21,8 @@ jobs:
             tox_env: "py36"
           - python: "3.7"
             tox_env: "py37"
+          - python: "3.8"
+            tox_env: "py38"
 
     steps:
     - uses: actions/checkout@v1

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{27,34,35,36,37}, linting, norewrite
+envlist = py{27,34,35,36,37,38}, linting, norewrite
 
 [testenv]
 passenv = USER USERNAME