Bump version to 0.23.4

Merge pull request libgit2#3452 from ethomson/0.23_xdiff

0.23 xdiff

Bump version to 0.23.2

Bump version to v0.23.1

Update CHANGELOG with the release number

Merge pull request libgit2#3290 from libgit2/cmn/filter-doc

filter: add docs for streaming filters

CHANGELOG: add submodule changes

Merge pull request libgit2#3245 from libgit2/cmn/no-grow

blob: don't recomment using git_buf_grow

Bump version to 0.22.2

checkout tests: cleanup realpath impl on Win32