GUACAMOLE-210: Update API to 0.9.13-incubating.

extensions/guacamole-auth-openid/src/main/java/org/apache/guacamole/auth/openid/OpenIDAuthenticationProvider.java

@@ -63,6 +63,11 @@ public class OpenIDAuthenticationProvider implements AuthenticationProvider {
         return "openid";
     }
 
+    @Override
+    public Object getResource() throws GuacamoleException {
+        return null;
+    }
+
     @Override
     public AuthenticatedUser authenticateUser(Credentials credentials)
             throws GuacamoleException {

extensions/guacamole-auth-openid/src/main/resources/guac-manifest.json

@@ -1,6 +1,6 @@
 {
 
-    "guacamoleVersion" : "0.9.11-incubating",
+    "guacamoleVersion" : "0.9.13-incubating",
 
     "name"      : "OpenID Authentication Extension",
     "namespace" : "guac-openid",