added subcategory to readme

Author: jjannix

readme.md

@@ -12,4 +12,6 @@
     | `/say`|Repeats the given message.|Utility|
     | `/log`|Allows for custom entries in the bot-log channel.|Utility|
     | `/invite`|Creates an invite link for the server. Privately or publicly served.|Utility|
-    | `/avatar`|Sends the avatar of a specified User.|Fun|  
+    | `/avatar`|Sends the avatar of a specified User.|Fun|  
+
+- ## List of future commands