Removing the version means that rebuilds are reproducible over time.
Both the generator tag and its version attribute are optional:
http://tools.ietf.org/html/rfc4287#section-4.2.4
guid => $guid,
feeddate => date_3339($lasttime),
feedurl => $feedurl,
- version => $IkiWiki::version,
);
run_hooks(pagetemplate => sub {
shift->(page => $page, destpage => $page,
<id><TMPL_VAR PAGEURL></id>
</TMPL_IF>
<subtitle type="html"><TMPL_VAR FEEDDESC ESCAPE=HTML></subtitle>
-<generator uri="http://ikiwiki.info/" version="<TMPL_VAR VERSION>">ikiwiki</generator>
+<generator uri="http://ikiwiki.info/">ikiwiki</generator>
<updated><TMPL_VAR FEEDDATE></updated>
<TMPL_VAR CONTENT>
</feed>