Updated WHATSNEW for <war> and <unwar>.

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git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@267999 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -45,7 +45,8 @@ behavior has been dropped.
 Other changes:
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-* New tasks: antstructure, cab, execon, fail, ftp, genkey, jlink, junit, sql, javacc, jjtree, starteam.
+* New tasks: antstructure, cab, execon, fail, ftp, genkey, jlink,
+junit, sql, javacc, jjtree, starteam, war, unwar.
 
 * New tasks mparse pending documentation.