We do not need to check coverage for this project.

--- readme_renderer-44.0/tox.ini.orig
+++ readme_renderer-44.0/tox.ini
@@ -13,12 +13,11 @@
 wheel_build_env = build_wheel
 deps =
     pytest
-    pytest-cov
 setenv =
     # Display up to 20 frames in backtraces when showing ResourceWarnings.
     PYTHONTRACEMALLOC=20
 commands =
-    pytest -Wall --strict-markers --cov {posargs}
+    pytest -Wall --strict-markers
 extras = md
 
 [testenv:mypy]