Add changelog

Author: laurynas

CHANGELOG.md

@@ -0,0 +1,24 @@
+# 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).
+
+
+## v3.0.0
+
+### Added
+- `detectBatch()` for batch detections
+
+### Changed
+- Switched to v3 API which uses updated language detection model
+- ⚠️ `detect()` result fields are `language` and `score`
+- Switched to the native `fetch` API. Minimum supported Node version 8.
+
+### Deprecated
+- Calling `detect()` with array argument. Use `detectBatch` instead.
+- `userStatus()` - Use `accountStatus()` instead.
+
+### Removed
+- `axios` dependency

README.md

@@ -12,6 +12,10 @@ Node.js client for the [Detect Language API](https://detectlanguage.com/).
 npm install detectlanguage [--save]
 ```
 
+### Upgrading
+
+When upgrading please check [changelog](CHANGELOG.md) for breaking changes.
+
 ## Configuration
 
 Before using Detect Language API client you have to setup your personal API key.