Ensure tox-cover is non-voting

Change-Id: I67adf3da103bbd6a6b33a693f8c7c0316c5fbb7f
Depends-On: Ieb13b7b6b750414d03cc084b9f0b30a26b304e6e
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/.zuul.yaml b/.zuul.yaml
index 8095733..3922dd3 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -3,7 +3,8 @@
     check:
       jobs:
         - tox-docs
-        - tox-cover
+        - tox-cover:
+            voting: false
         - tox-pep8
         - tox-py35
         - tox-tarball