Fixes autodoc test

extra/release/doc4allmods

@@ -5,6 +5,7 @@ SKIP_PACKAGES="$PACKAGE tests management urls"
 SKIP_FILES="celery.five.rst
             celery.__main__.rst
             celery.task.sets.rst
+            celery.task.trace.rst
             celery.bin.rst
             celery.bin.celeryd_detach.rst
             celery.contrib.rst