fixed missing include in enum_if (thanks Marek Stopka)

ChangeLog

@@ -46,6 +46,7 @@ release 0.14.3
 	* fixed move_storage bug when files were renamed to be moved out
 	  of the root directory
 	* added error handling for set_piece_hashes
+	* fixed missing include in enum_if.cpp
 
 release 0.14.2
 

examples/enum_if.cpp

@@ -35,6 +35,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <libtorrent/broadcast_socket.hpp>
 #include <vector>
 #include <iomanip>
+#include <iostream>
 
 using namespace libtorrent;