Remove every old-style class.

src/plugins/plugin_exp_parrot.py

@@ -37,7 +37,7 @@ PLUGIN_INFO = {
 "description": _("""Implementation of parrot mode (repeat messages between 2 entities)""")
 }
 
-class Exp_Parrot():
+class Exp_Parrot(object):
     """Parrot mode plugin: repeat messages from one entity or MUC room to another one"""
     #XXX: This plugin can be potentially dangerous if we don't trust entities linked
     #     this is specially true if we have other triggers.