Update 'README.md'

README.md

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 Rewrite of my Discord bot, BunnyBot, in Go.
 
 Previous version, written in Javascript using Node.js: https://git.dtam.pw/daniel/discord-bot-js
+
+# TODO
+Restore previous functionality
+ - Allow roll ranges
+ - Add 8 ball
+ - Add compute
+ - Add voice commands
+
+Add caching mechanism for images