Fixes CI

Author: sobolevn

setup.cfg

@@ -133,7 +133,7 @@ omit =
   # which does not work with coverage:
   returns/contrib/mypy/*
   # pytest cannot measure self coverage:
-  returns/contrib/pytest/plugin.py
+  returns/contrib/pytest/*.py
   # Hypothesis is also excluded:
   returns/contrib/hypothesis/*