serialization: add missing include

src/serialization/joints.hpp

@@ -19,6 +19,7 @@
 #include <boost/serialization/variant.hpp>
 
 #include "pinocchio/serialization/joints-transform.hpp"
+#include "pinocchio/serialization/joints-motion.hpp"
 #include "pinocchio/serialization/joints-model.hpp"
 
 #endif // ifndef __pinocchio_serialization_joints_hpp__