[fix] Remove Endpoint.GCHANGE_API, as it is not part of the Duniter project

duniter4j-core-client/src/main/java/org/duniter/core/client/model/bma/EndpointApi.java

@@ -41,9 +41,8 @@ public enum EndpointApi implements IEndpointApi {
     ES_USER_API(),
     ES_SUBSCRIPTION_API(),
     MONIT_API(),
-    UNDEFINED(),
-    // TODO: remove this
-    GCHANGE_API();
+    UNDEFINED()
+    ;
 
 
     private static final Logger log = LoggerFactory.getLogger(EndpointApi.class);