Update tox.ini

Author: auvipy

tox.ini

@@ -18,7 +18,7 @@ deps=
 sitepackages = False
 recreate = False
 commands =
-    unit: py.test -xv --cov=amqp --cov-report=xml --no-cov-on-fail t/unit {posargs}
+    unit: pytest -xv --cov=amqp --cov-report=xml --no-cov-on-fail t/unit {posargs}
     integration: py.test -xv -E rabbitmq t/integration {posargs:-n2}
 basepython =
     flake8,apicheck,linkcheck,pydocstyle: python3.8