fix deshaw#8: Do not remove last empty line.

src/main.rs

@@ -161,6 +161,11 @@ fn process_file(
     })?;
     let cleaned_contents = String::from_utf8(ser.into_inner()).map_err(|e| format!("{:?}", e))?;
 
+    // Check if the original content ended with a newline and the cleaned content doesn't
+    if contents.ends_with('\n') && !cleaned_contents.ends_with('\n') {
+        cleaned_contents.push('\n'); // Append a newline if necessary
+    }
+
     if cleaned_contents != *contents {
         if let Some(file) = output_file {
             fs::write(&file, cleaned_contents)