https://github.com/romanz/electrs/blob/master/RELEASE-NOTES.md#0100-rc1-jun-21-2023

Does not look like much, just a continuing update.
Might be some things that are not commented on for the 0.9.14 -> 0.10.0 change or perhaps going to Rust 2021

Has always been a minor quibble of mine in general with software, what makes a 0.0.x update different from a 0.x update.
Things like that should be buried in a readme file someplace.
And no, on the few things I do write I don't put that in there but nobody really reads & uses that code other then me.....

-Dave