Hotfix for issue #4

The docs seem to say its okay to have an unbind method without arguments.
Probably a bug in EM?

Author: giganteous

lib/em-irc/client.rb

@@ -167,7 +167,7 @@ def ready
       end
 
       # @private
-      def unbind
+      def unbind(ignored)
         trigger(:disconnect)
       end
 
@@ -177,4 +177,4 @@ def channel?(string)
       end
     end
   end
-end
+end