Adding upstream version 3.0.22.

Signed-off-by: Daniel Baumann <daniel@debian.org>

.github/workflows/test.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, "3.10"]
+        python-version: [3.7, 3.8, 3.9, "3.10"]
 
     steps:
       - uses: actions/checkout@v2
@@ -23,14 +23,12 @@ jobs:
           sudo apt remove python3-pip
           python -m pip install --upgrade pip
           python -m pip install . black isort mypy pytest readme_renderer
-          python -m pip install . types-dataclasses  # Needed for Python 3.6
           pip list
       - name: Type Checker
         run: |
           mypy ptpython
           isort -c --profile black ptpython examples setup.py
           black --check ptpython examples setup.py
-        if: matrix.python-version != '3.6'
       - name: Run Tests
         run: |
           ./tests/run_tests.py