free recorder pixel data

src/Recorder.cpp

@@ -115,6 +115,7 @@ void Recorder::write_video_frames(fs::path directory)
                           frame->w, frame->h, gif_frame_length / 10);
         }
         elapsed += get_frame_length();
+        delete[] pixel_buffers.front();
         pixel_buffers.erase(pixel_buffers.begin());
         SDL_FreeSurface(frame);
     }