Fix cpplint errors

Author: bjsowa

include/web_video_server/h264_streamer.hpp

@@ -29,6 +29,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 #include "image_transport/image_transport.hpp"

include/web_video_server/image_streamer.hpp

@@ -30,6 +30,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 #include <opencv2/opencv.hpp>

include/web_video_server/jpeg_streamers.hpp

@@ -30,6 +30,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 #include "image_transport/image_transport.hpp"

include/web_video_server/libav_streamer.hpp

@@ -42,6 +42,7 @@ extern "C"
 #include <libavutil/imgutils.h>
 }
 
+#include <memory>
 #include <string>
 
 #include "image_transport/image_transport.hpp"

include/web_video_server/png_streamers.hpp

@@ -29,6 +29,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 #include "image_transport/image_transport.hpp"

include/web_video_server/ros_compressed_streamer.hpp

@@ -30,6 +30,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 #include "sensor_msgs/msg/compressed_image.hpp"

include/web_video_server/vp8_streamer.hpp

@@ -30,6 +30,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 #include "image_transport/image_transport.hpp"

include/web_video_server/vp9_streamer.hpp

@@ -29,6 +29,8 @@
 
 #pragma once
 
+#include <memory>
+
 #include "image_transport/image_transport.hpp"
 #include "web_video_server/libav_streamer.hpp"
 #include "async_web_server_cpp/http_request.hpp"

include/web_video_server/web_video_server.hpp

@@ -31,6 +31,7 @@
 #pragma once
 
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>