Also include Python 3.9

Author: stefankoegl

.travis.yml

@@ -5,9 +5,9 @@ python:
 - '3.6'
 - '3.7'
 - '3.8'
-- 3.8-dev
+- '3.9'
+- 3.10-dev
 - nightly
-- pypy
 - pypy3
 install:
 - travis_retry pip install coveralls

setup.py

@@ -45,6 +45,7 @@
     'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
+    'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: Implementation :: CPython',
     'Programming Language :: Python :: Implementation :: PyPy',
     'Topic :: Software Development :: Libraries',