update changelog

Author: devblackops

CHANGELOG.md

@@ -33,6 +33,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Remove invisible unicode characters from chat backend response before parsing the message
 - Disable $PSStyle output rendering so ANSI escape sequences don't get sent back to the chat backend
 - Fixed [**#239**](https://github.com/poshbotio/PoshBot/issues/239) for Discord backend by specifying the user-agent on REST calls and switch to using `https://discord.com/api` instead of `https://discordapp.com/api` (via [@phdavis](https://github.com/phdavis))
+- Fixed [**#241**](https://github.com/poshbotio/PoshBot/issues/241) by adding additonal Discord channel types (via [@Windos](https://github.com/Windos))
 
 ### Changed