Drop Python 3.6 Support

.github/workflows/default.yml

@@ -45,20 +45,20 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.6, 3.7, 3.8, 3.9, '3.10']
+        python-version: [3.7, 3.8, 3.9, '3.10']
         exclude:
-          - os: macos-latest
-            python-version: 3.6
           - os: macos-latest
             python-version: 3.7
           - os: macos-latest
             python-version: 3.8
-          - os: windows-latest
-            python-version: 3.6
+          - os: macos-latest
+            python-version: 3.9
           - os: windows-latest
             python-version: 3.7
           - os: windows-latest
             python-version: 3.8
+          - os: windows-latest
+            python-version: 3.9
 
     steps:
     - uses: actions/checkout@v2