fix: update tox to emit junit format for coveralls

Author: vinitkumar

tox.ini

@@ -9,10 +9,4 @@ deps =
 allowlist_externals = pytest
 
 commands =
-    pytest --cov=json2xml --cov-report=xml
-    python \
-      -W error::ResourceWarning \
-      -W error::DeprecationWarning \
-      -W error::PendingDeprecationWarning \
-      -m coverage run \
-      -m pytest {posargs:tests}
+    pytest --cov --junitxml=junit.xml