Python 3.9 (#40)

* Python 3.9
* Python 3.9 requires Visual Studio 2019 image

Author: xyb

.appveyor.yml

@@ -54,6 +54,14 @@ environment:
     - PYTHON: "C:\\Python38-x64"
       PYTHON_VERSION: "3.8"
       PYTHON_ARCH: "64"
+    - PYTHON: "C:\\Python39"
+      PYTHON_VERSION: "3.9"
+      PYTHON_ARCH: "32"
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+    - PYTHON: "C:\\Python39-x64"
+      PYTHON_VERSION: "3.9"
+      PYTHON_ARCH: "64"
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
     # build wheels
     - PYTHON: "C:\\Python36-x64"
       PYTHON_VERSION: "3.6"

.travis.yml

@@ -38,6 +38,10 @@ matrix:
       arch: amd64
     - python: 3.8
       arch: arm64
+    - python: 3.9
+      arch: amd64
+    - python: 3.9
+      arch: arm64
     - python: nightly
       arch: amd64
     - python: pypy

setup.py

@@ -64,6 +64,7 @@ def readfile(filename):
         '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',
     ],
     python_requires=">=2.6, !=3.0.*, !=3.1.*, !=3.2.*",