Declare support for and test Python 3.9

Author: hugovk

.travis.yml

@@ -9,6 +9,7 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
+  - "3.9"
 
 matrix:
   include:

CHANGELOG.md

@@ -9,6 +9,7 @@
   [#164](https://github.com/sybrenstuvel/python-rsa/issues/164))
 - Reuse of blinding factors to speed up blinding operations.
   Fixes [#162](https://github.com/sybrenstuvel/python-rsa/issues/162).
+- Declare & test support for Python 3.9
 
 
 ## Version 4.4 & 4.6 - released 2020-06-12

setup.py

@@ -49,6 +49,7 @@
               '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 :: Security :: Cryptography',

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 # Environment changes have to be manually synced with '.travis.yml'.
-envlist = py35,py36,p37,p38
+envlist = py35,py36,p37,p38,p39
 
 [pytest]
 addopts = -v --cov rsa --cov-report term-missing