update compability matrix

README.md

@@ -41,7 +41,8 @@ compatibility of one minor version between client and server:
 
 | kured  | kubectl | k8s.io/client-go | k8s.io/apimachinery | expected kubernetes compatibility |
 |--------|---------|------------------|---------------------|-----------------------------------|
-| master | 1.14.1  | v11.0.0          | release-1.14        | 1.13.x, 1.14.x, 1.15.x            |
+| master | 1.15.10 | v12.0.0          | release-1.15        | 1.15.x, 1.16.x, 1.17.x            |
+| 1.3.0  | 1.15.10 | v12.0.0          | release-1.15        | 1.15.x, 1.16.x, 1.17.x            |
 | 1.2.0  | 1.13.6  | v10.0.0          | release-1.13        | 1.12.x, 1.13.x, 1.14.x            |
 | 1.1.0  | 1.12.1  | v9.0.0           | release-1.12        | 1.11.x, 1.12.x, 1.13.x            |
 | 1.0.0  | 1.7.6   | v4.0.0           | release-1.7         | 1.6.x, 1.7.x, 1.8.x               |