Merge https://github.com/jaraco/skeleton

Author: jaraco

.github/workflows/main.yml

@@ -6,7 +6,10 @@ jobs:
   test:
     strategy:
       matrix:
-        python: [3.6, 3.8, 3.9]
+        python:
+        - 3.6
+        - 3.9
+        - 3.10.0-alpha - 3.10.99
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps: