add python 3.8

.github/workflows/pythonpackage.yml

@@ -15,9 +15,9 @@ jobs:
 
     runs-on: ubuntu-18.04
     strategy:
-      max-parallel: 3
+      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

@@ -3,7 +3,8 @@ language: python
 python:
   - "3.5"
   - "3.6"
-  - "3.7"
+  - "3.7"
+  - "3.8"
 
 script:
   - pytest -v