Add changelog

Author: laurynas

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## v2.0.0
+
+### Added
+- `context` to all API methods
+
+### Changed
+- Switched to v3 API which uses updated language detection model
+- Language detection results contains `Language` and `Score`
+- `UserStatus()` renamed to `AccountStatus()`