Remove unused include

This code has never used strands.

Tested: Code compiles

Change-Id: I59a204fe3f3a26b2a9a8ede990335c58889fb7e6
Signed-off-by: Ed Tanous <edtanous@google.com>
diff --git a/redfish-core/include/server_sent_events.hpp b/redfish-core/include/server_sent_events.hpp
index 695c483..e9ff212 100644
--- a/redfish-core/include/server_sent_events.hpp
+++ b/redfish-core/include/server_sent_events.hpp
@@ -19,7 +19,6 @@
 #include "logging.hpp"
 
 #include <boost/asio/ip/tcp.hpp>
-#include <boost/asio/strand.hpp>
 #include <boost/beast/http/buffer_body.hpp>
 #include <boost/beast/http/message.hpp>
 #include <boost/beast/http/read.hpp>