Some meta discussion: "xyz reaches/releases version number 234234.324234" is entirely meaningless and the best way to ensure that nobody will care about your release announcement. Your project may internally have a very well defined and entirely logical policy as to how exactly to change version numbers based on internal project changes, but from the outside this is 100% untrustable and invisible, meaning your 2.0 release could mean anything from "we rewrote the entire thing" or "a set amount of time went by" (see Firefox/Perl/probably others).
If you actually care at all about your release announcement being read, include in the title line the actual benefit the new version provides to people.