Added spec version 0.4 and added a changelog that will cover all changes more detailed in the future. No code changes. (0.40.5)

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) (during 0.x.y development phase).
+
+## [0.40.5] - 2026-04-10
+### Removed
+- All `libsql` support.
+- All `tcltk` support.
+
+## [0.40.0] - 2026-03-25
+### Added
+- Nested functions support in the Fun parser.
+- Higher-order function patterns enabled by nesting.
+
+## [0.39.15] - 2026-03-10
+### Added
+- Initial GitHub Actions CI workflow.
+- Automated execution of examples in CI.
+### Changed
+- Refactored examples directory structure.
+### Fixed
+- Line number reporting in error messages.
+
+## [0.30.0] - 2025-11-15
+### Added
+- `libcurl` (cURL) support for networking.
+- `CRC32` and `CRC32C` classes in stdlib.
+
+---
+*Note: Dates for older versions are approximate based on repository history.*