Test latest Python 3.11 (#188)

b1 is out

Author: hugovk

.github/workflows/run-tests.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, "3.10", "3.11.0-alpha.4"]
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9, "3.10", "3.11-dev"]
         os: [ubuntu-latest]
 
     steps: