Update TODO list.

Author: bmomjian

doc/TODO

@@ -1,6 +1,6 @@
 TODO list for PostgreSQL
 ========================
-Last updated:		Fri May 18 11:17:58 EDT 2001
+Last updated:		Fri May 18 12:28:02 EDT 2001
 
 Current maintainer:	Bruce Momjian (pgman@candle.pha.pa.us)
 
@@ -282,6 +282,7 @@ MISCELLANEOUS
   connection pooling
 * Make blind writes go through the file descriptor cache
 * Allow logging of query durations
+* Add hash-based aggregates
 
 SOURCE CODE
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