[gnote] Add missing include

[Aurimas Černius <aurimasc src gnome org>]

commit ef34b47371387d7de7a93a3bfe7103716e292568
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sat Apr 13 13:52:30 2019 +0300

    Add missing include

 src/triehit.hpp | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/triehit.hpp b/src/triehit.hpp
index d0dfe80d..3610dd4a 100644
--- a/src/triehit.hpp
+++ b/src/triehit.hpp
@@ -23,6 +23,7 @@
 #define __TRIEHIT_HPP_
 
 #include <list>
+#include <memory>
 
 #include <glibmm/ustring.h>