fix codeclimate

src/main/java/ru/vk/itmo/test/volkovnikita/HttpServerImpl.java

@@ -1,6 +1,11 @@
 package ru.vk.itmo.test.volkovnikita;
 
-import one.nio.http.*;
+import one.nio.http.HttpException;
+import one.nio.http.HttpServer;
+import one.nio.http.HttpServerConfig;
+import one.nio.http.HttpSession;
+import one.nio.http.Request;
+import one.nio.http.Response;
 import one.nio.net.Session;
 import one.nio.net.Socket;
 import one.nio.server.AcceptorConfig;
@@ -33,7 +38,11 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.Optional;
-import java.util.concurrent.*;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;