Remove no longer needed import from MultiProtocolJSONServer

Author: robert-s-ubi

ocpp-v2/src/main/java/eu/chargetime/ocpp/MultiProtocolJSONServer.java

@@ -35,7 +35,6 @@ of this software and associated documentation files (the "Software"), to deal
 import eu.chargetime.ocpp.wss.WssFactoryBuilder;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 import java.util.UUID;
 import java.util.concurrent.CompletionStage;