Good idea. Allegro libraries are entirely independent from the source, but since I provide Windows binaries myself that many use, it's good style to mention that in the version history. Lix 0.9.7 was the first to ship with Allegro 5.2.3.
If you build from source and want the 5.2.3 libs, you need to download the .lib/.dll zip archive again, as explained in doc/build/windows.txt.
-- Simon