Extend the list of whitelisted commands on newcomers

Also, hopefully the new logic is (at least slightly) better.

Robocop.py

@@ -190,9 +190,11 @@ async def on_message(message):
     if (message.guild) and (message.guild.id not in config.guild_whitelist):
         return
 
-    # Ignore messages in newcomers channel, unless it's potentially reset
+    # Ignore messages in newcomers channel, unless it's potentially
+    # an allowed command
+    welcome_allowed = ["reset", "kick", "ban", "warn"]
     if message.channel.id == config.welcome_channel and\
-            "reset" not in message.content:
+            not any(cmd in message.content for cmd in welcome_allowed):
         return
 
     ctx = await bot.get_context(message)