Added changelog

CHANGELOG.md

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+
+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [1.0.0] - 2024-01-15
+
+Added support for Pydantic V2 (version - ^2.5).
+
+### Added
+
+- Test coverage for Python versions `3.11` and `3.12`
+
+### Changed
+- Python base version from `3.7` to `3.8`.
+- Changed Pydantic version from `^1.8.2` to `^2.5`.
+- Updated Model validation function from `parse_obj` to `model_validate`.
+- Renamed backend initialization class from `Config` to `db_config` to follow pydantic's naming convention.
+- Updated method for generation of dictionary from `dict` to `model_dump`.
+
+### Fixed
+
+
+## [0.4.2] - 2023-11-16
+
+Added count() for dynamo backend that returns integer count as total.