cody precord: small patch to fix a compatibility issue between python2.5 and 2.4

IPython/twshell.py

@@ -200,7 +200,7 b' class TwistedInteractiveShell(InteractiveShell):'
 
 
 
-class IPShellTwisted():
+class IPShellTwisted:
     """Run a Twisted reactor while in an IPython session.
 
     Python commands can be passed to the thread where they will be