Merge pull request #107 from AzureAD/python38

Enable Python 3.8 in test automation

Author: rayluo

.travis.yml

@@ -11,6 +11,9 @@ matrix:
     - python: 3.7
       dist: xenial
       sudo: true
+    - python: 3.8
+      dist: xenial
+      sudo: true
 
 install:
   - pip install -r requirements.txt