add python 3.8 to CI

.travis.yml

@@ -8,6 +8,7 @@ python:
   - '3.5'
   - '3.6'
   - '3.7'
+  - '3.8'
 
 # commands to install dependencies
 before_install:

setup.py

@@ -74,6 +74,8 @@ setup(
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
     ],
 
     # What does your project relate to?