Update debugger invocation with recent IPython

neo/lib/debug.py

@@ -59,8 +59,11 @@ def debugHandler(sig, frame):
 def getPdb():
     try: # try ipython if available
         import IPython
-        IPython.Shell.IPShell(argv=[])
-        return IPython.Debugger.Tracer().debugger
+        try:
+            shell = get_ipython()
+        except NameError:
+            shell = IPython.frontend.terminal.embed.InteractiveShellEmbed()
+        return IPython.core.debugger.Pdb(shell.colors)
     except ImportError:
         import pdb
         return pdb.Pdb()