Run travis build on python 3.8 and 3.9

Author: tboggs

.travis.yml

@@ -1,7 +1,7 @@
 language: python
 sudo: false
 
-python: ["2.7", "3.5", "3.6", "3.7"]
+python: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9"]
 matrix:
   include:
     - python: 2.6