Add changelog for release

Author: MGatner

CHANGELOG.md

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+# Release Notes
+
+## [Unreleased](https://github.com/heroespatchnotes/sdk-php/compare/v0.9-beta.2...develop)
+
+## [v0.9-beta.2 (2020-12-26)](https://github.com/laravel/laravel/compare/v0.9-beta.1...v0.9-beta.2)
+
+### Added
+- `Entity::string(string $key)` New method for accessing Entity curated game strings ([](https://github.com/heroespatchnotes/sdk-php/commit/68b98422031f165afd2ba58cf1095ca2bf4a07ad))
+
+### Removed
+
+- **BC** Because of `Entity::string()` the `Skill` strings are no longer included in its `$contents` for magic access ([](https://github.com/heroespatchnotes/sdk-php/commit/68b98422031f165afd2ba58cf1095ca2bf4a07ad))