Update TODO list.

doc/TODO

 TODO list for PostgreSQL
 ========================
-Last updated:		Fri May  4 18:08:44 EDT 2001
+Last updated:		Mon May  7 13:04:50 EDT 2001
 
 Current maintainer:	Bruce Momjian (pgman@candle.pha.pa.us)
 
@@ -291,6 +291,7 @@ SOURCE CODE
 * Decide on spelling of indexes/indices
 * Allow ps status display to work on Solaris/SVr4-based systems
 * Move some things from /contrib into main tree, like soundex
+* Allow plug-in modules to emulate features from other databases
 
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