expand python matrix

Author: RonnyPfannschmidt

.github/workflows/pythonapp.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         # todo: extract from source
-        python-version: [2.7, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: [2.7, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, "3.10", "3.11-dev"]
         install-style: [full, editable]
 
     steps: