Include Python 3.11 in nox tests and Github actions matrix (#56)

* Include Python 3.11 in nox tests and Github actions matrix

.github/workflows/ci.yml

@@ -26,6 +26,8 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: [3.9]
         include:
+          - os: ubuntu-latest
+            python-version: "3.11"
           - os: ubuntu-latest
             python-version: "3.10"
           - os: ubuntu-latest

noxfile.py

@@ -1,7 +1,7 @@
 import nox
 
 
-@nox.session(python=["3.7", "3.8", "3.9", "3.10"])
+@nox.session(python=["3.7", "3.8", "3.9", "3.10", "3.11"])
 def test(session):
     session.install("-rrequirements-dev.txt")
     session.install("-e", ".", "--no-build-isolation")