docs: added version comment (#86)

Signed-off-by: Kostis Kapelonis <[email protected]>

docs/provider-status.md

@@ -5,6 +5,11 @@ the Gateway API. You can find a contributed list of known implementations at the
 
 All providers should work out of the box with Argo Rollouts and the Gateway plugin.
 
+!!! warning
+    Notice that with 0.x implementations of the Gateway API, only the 0.2.0 release of the 
+    plugin will work. Versions from 0.3.0 and upwards need a v1.0+ implementation 
+    to work. Plugin version 0.2.0 uses `v1beta1` resources while 0.3.0 needs `gateway.networking.k8s.io/v1` resources
+
 For convenience we are including here a list of those actually tested with the plugin along with the related example (if applicable).