remove py3.6 test

Author: lidong

.github/workflows/pythonpackage.yml

@@ -3,27 +3,6 @@ name: Python package
 on: [push]
 
 jobs:
-    test-py36:
-        runs-on: windows-2019
-        strategy:
-            max-parallel: 1
-            matrix:
-                python-version: ["3.6"]
-
-        steps:
-            - uses: actions/checkout@v1
-            - name: Set up Python ${{ matrix.python-version }}
-              uses: actions/setup-python@v1
-              with:
-                  python-version: ${{ matrix.python-version }}
-            - name: Install dependencies
-              run: |
-                  python -m pip install --upgrade pip
-                  python setup.py install
-            - name: Test with pytest
-              run: |
-                  pip install pytest
-                  pytest
     test-linux:
         runs-on: ubuntu-latest
         strategy: