Update readme

Author: khalim19

README.md

@@ -46,7 +46,7 @@ To run the generator, open GIMP and choose
 
 Alternatively, you may run the plug-in from the Python-Fu console: Open GIMP,
 choose `Filters -> Python-Fu -> Console` and enter
-`pdb.generate_predefined_completions_for_pydev()`.
+`pdb.generate_predefined_completions_for_pydev(True, True)`.
 
 
 Installing Predefined Completions in PyDev