add Python 3.9 to deployment action

.github/workflows/deploy.yml

@@ -12,36 +12,34 @@ jobs:
       TWINE_PASSWORD: ${{ secrets.TWINE_PASSWORD }}
     steps:
       - uses: actions/checkout@v2
-      - name: build and upload manylinux wheels
+      - name: Build and upload manylinux wheels
         uses:  mozman/manylinux-wheel-builder@master
         with:
           python-versions: "3.*"
         # if true then github actions won't stop even if build for this job fails
         continue-on-error: true
 
-  # deploy source distribution
+  # Deploy source distribution
   Source-dist:
     runs-on: windows-latest
     env:
       TWINE_USERNAME: ${{ secrets.TWINE_USERNAME }}
       TWINE_PASSWORD: ${{ secrets.TWINE_PASSWORD }}
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python
+      - name: Setup Python
         uses: actions/setup-python@v2
         with:
           python-version: 3.7
-      - name: create source distribution
+      - name: Create source distribution
         run: python setup.py sdist
-      - name: upload source distribution
+      - name: Upload source distribution
         run: |
           pip install twine
           twine upload dist/*
         continue-on-error: true
 
-  # Build and deploy wheels for macos and windows using setup-python action.
-  # This has nothing to do with manylinux-wheel-builder.
-  # I have just put them for the purpose of completion.
+  # Build and deploy wheels for MacOS and Windows
   Matrix-build:
     runs-on: ${{ matrix.os }}
     env:
@@ -50,19 +48,19 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, windows-latest]
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python
+      - name: Setup Python
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
-      - name: build wheel
+      - name: Build binary wheels
         run: |
           pip install wheel cython
           python setup.py bdist_wheel
-      - name: upload wheel
+      - name: Upload binary wheels
         run: |
           pip install twine
           twine upload dist/*
-        continue-on-error: true
+        continue-on-error: true

.github/workflows/testcext.yml

@@ -23,7 +23,6 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        # This are just testing requirements:
         python -m pip install pytest pyparsing geomdl cython
     - name: Install with C-extensions
       run: |

.github/workflows/testing.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        # exclude cython to test the pure Python verion
+        # Excluding Cython to test the pure Python version.
         python -m pip install pytest pyparsing geomdl
     - name: Install without C-extensions
       run: |