Add codecov upload step to CircleCI config
Add codecov upload step to CircleCI config

This step was missing during the migration from travis to CircleCI.
We're now able to upload the coverage directly from CircleCI, too.

Signed-off-by: Sascha Grunert <70ab469ddb2ac3e35f32ed7c2fd1cca514b2e879@suse.com>

kubernetes-incubator/ocid,mikebrow/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,mikebrow/cri-o,nalind/cri-o,nalind/cri-o,nalind/cri-o,mikebrow/cri-o,kubernetes-incubator/cri-o,mikebrow/cri-o