docs: add changelog

[Moskize91]

No description provided.

[coderabbitai]

Summary by CodeRabbit

• New Features

  • Added token usage monitoring with real-time statistics tracking.
  • Added support for dual-LLM scenarios.

• Bug Fixes

  • Fixed MathML inline element detection.
  • Improved whitespace normalization handling.
  • Enhanced display attributes consistency.

Walkthrough

This PR documents the v0.1.8 release with a changelog file describing new token usage monitoring capabilities in LLMs including real-time statistics (total_tokens, input_tokens, input_cache_tokens, output_tokens) and dual-LLM scenario support. It also documents bug fixes for MathML inline element detection via is_inline_element usage and whitespace normalization with normalize_whitespace, plus consistent DISPLAY_ATTRIBUTE handling. The version number in pyproject.toml is bumped from 0.1.7 to 0.1.8.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• docs: add chagelog #122: Addresses the same MathML handling improvements including is_inline_element usage and DISPLAY_ATTRIBUTE checks referenced in this changelog.

🚥 Pre-merge checks | ✅ 1 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	No description was provided, which is a significant omission for documenting the purpose and context of the changelog addition.	Add a description explaining what the v0.1.8 changelog covers (token monitoring features, bug fixes) and why it was added.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required format with type and subject, clearly describing the addition of changelog documentation.

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