docs: add new distribution packages to `README.md`

refactor(core): change `SocketImpl::buf` from `Vec<u8>` to `Box<[u8]>…

…` in `windows.rs`

This change ensures that raw pointers to the buffer, which are handed off to Windows to be written
async, will always be valid. This change is not strictly required for correctness as the `Vec` is
never modified in such a way that would cause it to reallocate.

doc: update `README.md` for 0.12.0 all items

fix4

fix3

fix2

fix2

fix

doc: update CHANGELOG.md for fujiapple852#1260

doc: update CHANGELOG.md for fujiapple852#1260