Test Python 3.9 (#51)

Author: hukkinj1

.github/workflows/release.yml

@@ -45,13 +45,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         fetch-depth: 50
         submodules: true
 
     - name: Set up Python 3.7
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v2
       with:
         python-version: 3.7
 
@@ -70,7 +70,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8]
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
         os: [ubuntu-16.04, macos-latest, windows-latest]
         exclude:
           # Python 3.5 is unable to properly
@@ -80,13 +80,13 @@ jobs:
             python-version: 3.5
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         fetch-depth: 50
         submodules: true
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -130,7 +130,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         fetch-depth: 5
         submodules: false

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8]
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
         os: [windows-latest, ubuntu-18.04, macos-latest]
         exclude:
           # Python 3.5 is unable to properly
@@ -25,7 +25,7 @@ jobs:
             python-version: 3.5
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         fetch-depth: 50
         submodules: true
@@ -41,7 +41,7 @@ jobs:
           __version__\s*=\s*(?:['"])([[:PEP440:]])(?:['"])
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v2
       if: steps.release.outputs.version == 0
       with:
         python-version: ${{ matrix.python-version }}

setup.py

@@ -59,6 +59,7 @@
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Operating System :: POSIX',
         'Operating System :: MacOS :: MacOS X',
         'Operating System :: Microsoft :: Windows',