add Python 3.11

Author: mmarchetti

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         # TODO: work on windows-latest compatibility?
         os: [ubuntu-latest]
-        python-version: ['3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
         include:
         - os: macos-latest
           python-version: '3.9'