Add Python 3.8 to CI

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.5, 3.6, 3.7]
+        python-version: [3.5, 3.6, 3.7, 3.8]
 
     steps:
       - uses: actions/checkout@v1

.travis.yml

@@ -24,8 +24,6 @@ matrix:
     - name: PyPy3.5 7.0 # Tested via anaconda PyPy (since travis's PyPy version is too old)
       python: "3.7"
       env: FEATURES="pypy" PATH="$PATH:/opt/anaconda/envs/pypy3/bin"
-  allow_failures:
-    - python: "3.8-dev"
 
 env:
   global:

tox.ini

@@ -2,6 +2,7 @@
 envlist = py35,
           py36,
           py37,
+          py38,
 minversion = 3.4.0
 skip_missing_interpreters = true