remove unnecessary includes

main.cc

@@ -1,12 +1,8 @@
 #include <arpa/inet.h>
 #include <curses.h>
-#include <fstream>
-#include <iostream>
 #include <netdb.h>
 #include <netinet/in.h>
-#include <ostream>
 #include <pthread.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <string>