Fix channel name format bug

Can't pass in #channel_name as an argument, so I'm passing in
channel_name (without the pound sign) instead. This means I need
to prepend the channel_name with the "#" sign.

irc_piled_on.rb

@@ -27,7 +27,7 @@ def set_led (color)
 bot = Cinch::Bot.new do
   configure do |c|
     c.server = server_url
-    c.channels = [channel]
+    c.channels = ["#" + channel]
     c.password = channel_password
     c.nick = "#{notify_user}_notifier"
   end
@@ -41,4 +41,4 @@ def set_led (color)
   end
 end
 
-bot.start
+bot.start