0.3.0 was really just the early version of AmpMod; 0.3.1 is the “new compiler” version (we increased the number for the sake of indicating that we made a big change - SemVer normally wouldn’t allow a change this big for a patch update, but we’re still on 0.x.x so we get a free pass until we’re on 1.x.x)
To most users though, they’ll probably still assume it’s just 0.3 because we’re marketing it as that.