Didn't you notice the "Implemented" tag? I've added compatibility with Alien Biomes in my first upload (version 0.0.7) after DellAquila transferred the mod to me, more than a year ago now. :-)
From the changelog:
Changes:
- Rewrote the code. The list of entities that will potentially give you maps isn't hard-coded anymore, but compiled while Factorio is loading. This means that now, not only vanilla entities, but also modded entities (trees from Alien Biomes, spawners/worms added by other mods, etc.) will leave a map after they've been killed.