Fix handling file names with periods before the file extension.

src/parser/document.rs

@@ -83,7 +83,7 @@ pub fn parse_file_with_settings<'g, 's, P: AsRef<Path>>(
         let full_path = file_path.as_ref().canonicalize()?;
         if doc.category.is_none() {
             let category = full_path
-                .file_prefix()
+                .file_stem()
                 .expect("File should have a name.")
                 .to_str()
                 .expect("File name should be valid utf-8.");