Merge pull request #243 from chenrui333/add-python-3.9

ci: add python 3.9

Author: spderosso

.appveyor.yml

@@ -9,6 +9,10 @@ environment:
     PYTHON: 'C:\Python38\python.exe'
   - GENERATOR: 'Visual Studio 14 Win64'
     PYTHON: 'C:\Python38-x64\python.exe'
+  - GENERATOR: 'Visual Studio 14'
+    PYTHON: 'C:\Python39\python.exe'
+  - GENERATOR: 'Visual Studio 14 Win64'
+    PYTHON: 'C:\Python39-x64\python.exe'
 
 init:
   - cmd: '%PYTHON% -m pip install -U nose wheel'

.travis.yml

@@ -5,8 +5,10 @@ addons:
     packages:
     - snapcraft
 python:
-- '3.7'
-- '3.8'
+  - '3.7'
+  - '3.8'
+  - '3.9'
+
 env: LIBGIT2=~/libgit2/_install/ LD_LIBRARY_PATH=~/libgit2/_install/lib
 before_install: ./.travis.sh
 install: pip install -r requirements.txt .