Add Python 3.11 release candidate 2 to the testing (#292)

* Add Python 3.11 release candidate 2 to the testing

* 3.11.0-rc - 3.11

Author: cclauss

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11.0-rc - 3.11"]
         os: [ubuntu-latest]
 
     steps: