bmap::CountedBitmap is an array of bits, with methods to set/clear bits by
index, and a built-in counter used to keep track of how many bits have been
set.
This crate has a very specific use case. You are probably looking for the bitvec crate.
Change log
The details of changes can always be found in the timeline, but for a high-level view of changes between released versions there's a manually maintained Change Log.