Add changelog

Author: laurynas

CHANGELOG.md

@@ -0,0 +1,21 @@
+# 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
+- `detect_batch` method for batch detections
+- Proxy support
+
+### Changed
+- Switched to v3 API which uses updated language detection model
+- ⚠️ `simple_detect` method renamed to `detect_code`
+- ⚠️ `detect` method result fields are `language` and `score`
+- ⚠️ `detect` method no longer accept arrays - use `detect_batch` instead
+- ⚠️ `user_status` method renamed to `account_status`
+- HTTPS is used by default. Removed secure mode configuration.

README.md

@@ -15,6 +15,10 @@ You can get it by signing up at https://detectlanguage.com
 pip install detectlanguage
 ```
 
+### Upgrading
+
+When upgrading please check [changelog](CHANGELOG.md) for breaking changes.
+
 ### Configuration
 
 ```python