fix C2027 from doctest

Author: Garcia6l20

test/ip_address_tests.cpp

@@ -7,6 +7,8 @@
 
 #include "doctest/doctest.h"
 
+#include <iostream> // error C2027 from doctest.h:861
+
 TEST_SUITE_BEGIN("ip_address");
 
 using cppcoro::net::ip_address;

test/ip_endpoint_tests.cpp

@@ -8,6 +8,8 @@
 
 #include "doctest/doctest.h"
 
+#include <iostream> // error C2027 from doctest.h:861
+
 TEST_SUITE_BEGIN("ip_endpoint");
 
 using namespace cppcoro::net;

test/ipv4_address_tests.cpp

@@ -7,6 +7,7 @@
 
 #include "doctest/doctest.h"
 
+#include <iostream> // error C2027 from doctest.h:861
 
 TEST_SUITE_BEGIN("ipv4_address");
 

test/ipv4_endpoint_tests.cpp

@@ -7,6 +7,8 @@
 
 #include "doctest/doctest.h"
 
+#include <iostream> // error C2027 from doctest.h:861
+
 TEST_SUITE_BEGIN("ip_endpoint");
 
 using namespace cppcoro::net;

test/ipv6_address_tests.cpp

@@ -7,6 +7,7 @@
 
 #include "doctest/doctest.h"
 
+#include <iostream> // error C2027 from doctest.h:861
 
 TEST_SUITE_BEGIN("ipv6_address");
 

test/ipv6_endpoint_tests.cpp

@@ -8,6 +8,8 @@
 
 #include "doctest/doctest.h"
 
+#include <iostream> // error C2027 from doctest.h:861
+
 TEST_SUITE_BEGIN("ipv6_endpoint");
 
 using namespace cppcoro::net;

test/sync_wait_tests.cpp

@@ -16,6 +16,8 @@
 
 #include "doctest/doctest.h"
 
+#include <iostream> // error C2027 from doctest.h:861
+
 TEST_SUITE_BEGIN("sync_wait");
 
 static_assert(std::is_same<