added todo comment for logger flush

cli/logger.h

@@ -18,6 +18,7 @@ public:
     {
         QMutexLocker locker(&this->mutex);
         *out << val;
+        //TODO: QDebug may not have flushed yet
         file->flush();
         return *this;
     }
@@ -27,6 +28,7 @@ public:
     {
         QMutexLocker locker(&this->mutex);
         *out << val;
+        //TODO: QDebug may not have flushed yet
         file->flush();
         return *this;
     }