add python 3.11 to tox tests

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = begin,py38,py39,py310,coverage,security,lint,bundle
+envlist = begin,py38,py39,py310,py311,coverage,security,lint,bundle
 
 [testenv]
 # build a wheel and test it
@@ -46,6 +46,11 @@ commands =
 commands =
     pytest --cov-append --cov={envsitepackagesdir}/incorporealcms/ --cov-branch
 
+[testenv:py311]
+# run pytest with coverage
+commands =
+    pytest --cov-append --cov={envsitepackagesdir}/incorporealcms/ --cov-branch
+
 [testenv:coverage]
 # report on coverage runs from above
 skip_install = true
@@ -91,6 +96,7 @@ exclude =
     versioneer.py
     _version.py
     instance/
+    venv/
 extend-ignore = T101
 max-complexity = 10
 max-line-length = 120