Include Nikon Raw image files

src/main.rs

@@ -278,7 +278,7 @@ async fn create_thumbnails() {
                     generate_video_thumbnail(entry.path(), &thumb_path);
                     false
                 } else {
-                    ext == "jpg" || ext == "jpeg" || ext == "png"
+                    ext == "jpg" || ext == "jpeg" || ext == "png" || ext == "nef"
                 }
             } else {
                 false