v1.5.1

# What's New in v1.5.1

This is a patch release with normalization bug fixes and an expanded vocabulary for Shekar's Persian text processing toolkit.

## Highlights

- **Expanded Vocabulary** – the built-in lexicon has been extended with additional Persian words, improving accuracy across tokenization, stemming, and normalization tasks.

## Bug Fixes

- Fixed minor bugs in the normalization pipeline.