readme: drop support for unsupported branches
@@ -18,9 +18,6 @@ CRI-O and Kubernetes follow the same release cycle and deprecation policy. For m
| Version - Branch | Kubernetes branch/version | Maintenance status |
|------------------------------|---------------------------------|--------------------|
-| CRI-O 1.13.x - release-1.13 | Kubernetes 1.13 branch, v1.13.x | = |
-| CRI-O 1.14.x - release-1.14 | Kubernetes 1.14 branch, v1.14.x | = |
-| CRI-O 1.15.x - release-1.15 | Kubernetes 1.15 branch, v1.15.x | = |
| CRI-O 1.16.x - release-1.16 | Kubernetes 1.16 branch, v1.16.x | = |
| CRI-O 1.17.x - release-1.17 | Kubernetes 1.17 branch, v1.17.x | = |
| CRI-O 1.18.x - release-1.18 | Kubernetes 1.18 branch, v1.18.x | = |
