add new OADP versions to velero support matrix (#1110)

Author: shubham-pampattiwar

README.md

@@ -78,6 +78,6 @@ versions. Here is the default mapping of versions:
 | v1.0.0 - v1.0.z |         v1.7.1 |
 | v1.1.0          |         v1.9.1 |
 | v1.1.1          |         v1.9.4 |
-| v1.1.2          |         v1.9.5 |
-| v1.1.3          |         v1.9.5 |
+| v1.1.2 - v1.1.5 |         v1.9.5 |
+| v1.2.0          |        v1.11.0 |