Include Nikon Raw image files

src/files.rs

@@ -32,6 +32,7 @@ fn is_image_or_video(path: &Path) -> bool {
         || extension == "jpeg"
         || extension == "mp4"
         || extension == "mov"
+        || extension == "nef"
 }
 
 pub fn is_valid_path(path: &str) -> Option<PathBuf> {