CHANGELOG.md in telegram-bot-ruby-0.5.1 vs CHANGELOG.md in telegram-bot-ruby-0.5.2

@@ -1,6 +1,14 @@
 # Changelog
 
+## 0.5.2
+
+- Implement Bot API 2.1 changes
+
+## 0.5.1
+
+- Update `Sticker` and `Message` objects (May 6, 2016 API update)
+
 ## 0.5.0
 
 - Replace [httparty](https://github.com/jnunemaker/httparty) with [faraday](https://github.com/lostisland/faraday)
 - Implement [Bot API 2.0](https://core.telegram.org/bots/2-0-intro)