FIX: Fixed missing <cassert> header

src/message.h

@@ -5,6 +5,8 @@
 #ifndef PROJECT_MESSAGE_H
 #define PROJECT_MESSAGE_H
 
+#include <cassert>
+
 #define MSG_INFO(str) std::cout << "INFO: " << str << std::endl;
 #define MSG_DEBUG(str) assert(std::cerr << "DEBUG:" << str << std::endl);