tox.ini: Fix choking on venvs with symlink to dirs: skip untracked files

Author: bernhardkaindl

tox.ini

@@ -131,7 +131,7 @@ commands    =
     coverage html -d {envlogdir}/htmlcov
     coverage html -d {envlogdir}/htmlcov-tests --fail-under {env:TESTS_COV_MIN:96}    \
                       --include="tests/*"
-    diff-cover --compare-branch=origin/master --include-untracked                     \
+    diff-cover --compare-branch=origin/master                                         \
       {env:PY3_DIFFCOVER_OPTIONS} --fail-under {env:DIFF_COV_MIN:92}                  \
       --html-report  {envlogdir}/coverage-diff.html                                   \
                      {envlogdir}/coverage.xml