Update to latest clang-format

Refer:https://github.com/openbmc/docs/blob/ac5d544553934f8083c61c5986a1420261bc8a4c/style/cpp/.clang-format

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I1e06864afc29ce7de463e62fa2a0eb6f70e8fd93
diff --git a/sessions_manager.hpp b/sessions_manager.hpp
index 5fefbcc..cd7f016 100644
--- a/sessions_manager.hpp
+++ b/sessions_manager.hpp
@@ -4,9 +4,10 @@
 #include "session.hpp"
 
 #include <boost/asio/steady_timer.hpp>
-#include <chrono>
 #include <ipmid/api.hpp>
 #include <ipmid/sessiondef.hpp>
+
+#include <chrono>
 #include <map>
 #include <memory>
 #include <mutex>
@@ -35,8 +36,7 @@
 {
   private:
     struct Private
-    {
-    };
+    {};
 
   public:
     // BMC Session ID is the key for the map