Test python3.9 support

.travis.yml

@@ -2,63 +2,70 @@ language: python
 cache: pip
 jobs:
   include:
+    - name: "Python 3.9"
+      dist: xenial
+      python: '3.9-dev'
+      install:
+        - pip install -r requirements.txt
+      script:
+        - flake8 --count
+        - python setup.py bdist_wheel sdist
     - name: "Python 3.8"
       dist: xenial
       python: '3.8'
       install:
         - pip install -r requirements.txt
       script:
         - flake8 --count
-        - python setup.py bdist_wheel
+        - python setup.py bdist_wheel sdist
     - name: "Python 3.7"
       dist: xenial
       python: '3.7'
       install:
         - pip install -r requirements.txt
       script:
         - flake8 --count
-        - python setup.py bdist_wheel
+        - python setup.py bdist_wheel sdist
     - name: "Python 3.6"
       dist: xenial
       python: '3.6'
       install:
         - pip install -r requirements.txt
       script:
         - flake8 --count
-        - python setup.py bdist_wheel
+        - python setup.py bdist_wheel sdist
     - name: "Python 3.5"
       dist: xenial
       python: '3.5'
       install:
         - pip install -r requirements.txt
         - flake8 --count
       script:
-        - python setup.py bdist_wheel
+        - python setup.py bdist_wheel sdist
     - name: "Python 3.4"
       dist: trusty
       python: '3.4'
       install:
         - pip install -I -r requirements.txt
       script:
         - flake8 --count --ignore=F401 .
-        - python setup.py bdist_wheel
+        - python setup.py bdist_wheel sdist
     - name: "Python 3.3"
       dist: trusty
       python: '3.3'
       install:
         - pip install -I -r requirements.txt
       script:
         - flake8 --count --ignore=F401 .
-        - python setup.py bdist_wheel
+        - python setup.py bdist_wheel sdist
     - name: "Python 2.7"
       dist: xenial
       python: '2.7'
       install:
         - pip install -r requirements.txt
       script:
         - flake8 --count
-        - python setup.py bdist_wheel
-before_deploy: python setup.py sdist
+        - python setup.py bdist_wheel sdist
 deploy:
   - provider: pypi
     user: dolfinus

setup.py

@@ -30,6 +30,7 @@
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
     ],