Allow tox to fail if under covered

tox.ini

@@ -43,7 +43,6 @@ extras =
 commands_pre =
   # safety measure to assure we do not accidentally run tests with broken dependencies
   {envpython} -m pip check
-
   # cleaning needed to prevent errors between runs
   sh -c "rm -f {envdir}/.coverage* 2>/dev/null || true"
 commands =
@@ -57,7 +56,7 @@ commands =
       coverage combine -q --data-file={envdir}/.coverage {envdir}/.coverage.* && \
       coverage xml --data-file={envdir}/.coverage -o {envdir}/coverage.xml --ignore-errors --fail-under=0 && \
       COVERAGE_FILE={envdir}/.coverage coverage lcov --fail-under=0 --ignore-errors -q && \
-      COVERAGE_FILE={envdir}/.coverage coverage report --fail-under=0 --ignore-errors \
+      COVERAGE_FILE={envdir}/.coverage coverage report --ignore-errors \
       "
   # We fail if files are modified at the end
   git diff --exit-code