Save then clear your site cache, via yourstore.com/youradmin.php?cc - ie. add "?cc" to the end of your admin URL.
Note I very much doubt there will be any further releases in V2 nor V3, under normal conditions where future updates are expected, this file would be replaced during the upgrade, so you would have to reapply your changes as there is no Breadcrumbs hook. In saying that...
You could create your own template, in:-
Name the file my_breadcrumbs.tpl or similar, but must end in ".tpl", use the code as above then you can create a new block and select your new custom template file to replace the current Breadcrumbs block. This should be future proof - but as I said, don't hold your breath for another V2/V3 release.