NextMillennium: Adapter and server version

src/main/java/org/prebid/server/bidder/nextmillennium/NextMillenniumBidder.java

@@ -112,7 +112,7 @@ private BidRequest updateBidRequest(BidRequest bidRequest, ExtImpNextMillennium
 
         final Imp firstImp = bidRequest.getImp().getFirst();
         final ObjectNode updatedImpExt = mapper.mapper().createObjectNode();
-        updatedImpExt.set("nextMillennium", nextMillenniumNode);
+        updatedImpExt.set("nextMillennium", nextMillenniumNode.get("nmmFlags"));
 
         final ObjectNode prebidNode = mapper.mapper().createObjectNode();
         prebidNode.set("storedrequest", mapper.mapper().valueToTree(storedRequest));

src/test/resources/org/prebid/server/it/openrtb2/nextmillennium/test-nextmillennium-bid-request.json

@@ -9,7 +9,7 @@
       },
       "secure": 1,
       "ext": {
-        "nextMillennium": {},
+        "nextMillennium": [ "1" ],
         "prebid": {
           "storedrequest": {
             "id": "placement_id"