docs: update changelog for 2.0.0

Author: d-Rickyy-b

CHANGELOG.md

@@ -6,6 +6,8 @@ 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).
 
 ## [Unreleased]
+
+## [2.0.0] - 2022-08-25
 ### Added
 - Store prices per location per entity
 - Allow skinflint.co.uk links
@@ -15,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Display price agent name (& link) in price history graph caption
 - Display currency in price history graph
 - Send new message with price agent details when clicking on the button for the price notification message
+- Ability to switch graph theme (dark/light)
 
 ### Fixed
 - Improve graph visibility
@@ -27,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [1.0.0] - 2022-02-14
 Initial release! First stable version of GoGeizhalsBot is published as v1.0.0 
 
-[unreleased]: https://github.com/d-Rickyy-b/GoGeizhalsBot/compare/v1.1.0...HEAD
+[unreleased]: https://github.com/d-Rickyy-b/GoGeizhalsBot/compare/v2.0.0...HEAD
+[2.0.0]: https://github.com/d-Rickyy-b/GoGeizhalsBot/compare/v1.1.0...v2.0.0
 [1.1.0]: https://github.com/d-Rickyy-b/GoGeizhalsBot/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/d-Rickyy-b/GoGeizhalsBot/tree/v1.0.0