Add changelog

Changelog.md

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+# Changelog
+This file is used to list changes made to this software.
+
+## V1.0.0 [`unreleased`]
+_Current development version: **1.0.0-beta.3**_
+### Features
+- /info
+- /logchannel
+- /blocklist get
+- /blocklist add
+- /blocklist remove
+- /preservesettings
+- /showblocklist
+- /showsettings
+- Data will be deleted by default when the bot leaves the server
+- Server admins can change the behaviour of the bot when it leaves the server to keep the data persistent
+- Scans for blocked words in channel names and renames channels to "CENSORED" if found
+- When settings are changed or channels are censored, notifications to a logchannel can be enabled
+- CLI to change settings and get information during runtime by attaching to the apps docker container
+- API for automated uptime checks to prevent the bot from going offline unnoticed