Update compatibility matrix to mention v1.20
Update compatibility matrix to mention v1.20

This also removes the mentioning of v1.17 as well as sorting the table
in the way that the most recent entry is on top.

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

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