[Full Changelog](https://github.com/nodegit/nodegit/compare/v0.18.0...v0.19.0)

- You can now convert tree entries in blobs [PR #1272](https://github.com/nodegit/nodegit/pull/1272)

- [fileops: fix leaking fd in `mmap_ro_file` #4201](https://github.com/libgit2/libgit2/pull/4201)

- [README: document our relation to changes in upstream #4198](https://github.com/libgit2/libgit2/pull/4198)

- [filter: only close filter if it's been initialized correctly #4196](https://github.com/libgit2/libgit2/pull/4196)

- [Fix building against OpenSSL v1.1 #4195](https://github.com/libgit2/libgit2/pull/4195)

- [pkgconfig: fix handling of prefixes containing whitespaces #4193](https://github.com/libgit2/libgit2/pull/4193)

- [Refactor some of the win32 POSIX emulation #4192](https://github.com/libgit2/libgit2/pull/4192)

- [Correct non-existent file references in `odb.h` #4188](https://github.com/libgit2/libgit2/pull/4188)

- [Coverity #4183](https://github.com/libgit2/libgit2/pull/4183)

- [git_treebuilder_write_with_buffer refactorings #4182](https://github.com/libgit2/libgit2/pull/4182)

- [Fix memory leaks #4180](https://github.com/libgit2/libgit2/pull/4180)

- [sha1dc: perf improvements from upstream #4178](https://github.com/libgit2/libgit2/pull/4178)

- [inet_pton: don't assume addr families don't exist #4176](https://github.com/libgit2/libgit2/pull/4176)

- [git_futils: don't O_EXCL and O_TRUNC #4175](https://github.com/libgit2/libgit2/pull/4175)

- [Fix the documentation for git_cred_acquire_cb #4172](https://github.com/libgit2/libgit2/pull/4172)

- [Fix typo in remote.h API #4171](https://github.com/libgit2/libgit2/pull/4171)

- [Fix resolving absolute symlinks (on at least Win32) #4169](https://github.com/libgit2/libgit2/pull/4169)

- [Coverity fixes #4167](https://github.com/libgit2/libgit2/pull/4167)

- [Remove `map_free` macros #4166](https://github.com/libgit2/libgit2/pull/4166)

- [Worktree fixes #4163](https://github.com/libgit2/libgit2/pull/4163)

- [merge_driver: fix const-correctness for source getters #4162](https://github.com/libgit2/libgit2/pull/4162)

- [submodule: catch when submodule is not staged on update #4161](https://github.com/libgit2/libgit2/pull/4161)

- [Diff fixes #4160](https://github.com/libgit2/libgit2/pull/4160)

- [Skip uninteresting commits in revwalk timesort iterator #4157](https://github.com/libgit2/libgit2/pull/4157)

- [git_futils_readbuffer: don't compute sha-1 #4156](https://github.com/libgit2/libgit2/pull/4156)

- [Support namespaced references again #4154](https://github.com/libgit2/libgit2/pull/4154)

- [rebase: ignore untracked files in submodules #4151](https://github.com/libgit2/libgit2/pull/4151)

- [git_commit_create: freshen tree objects in commit #4150](https://github.com/libgit2/libgit2/pull/4150)

- [cmake: only enable supported compiler warning flags #4148](https://github.com/libgit2/libgit2/pull/4148)

- [winhttp: disambiguate error messages when sending requests #4146](https://github.com/libgit2/libgit2/pull/4146)

- [tests: refs::create: fix memory leak #4145](https://github.com/libgit2/libgit2/pull/4145)

- [Fix: make reflog include \"(merge)\" for merge commits #4143](https://github.com/libgit2/libgit2/pull/4143)

- [Fix minor typos in CONVENTIONS.md #4142](https://github.com/libgit2/libgit2/pull/4142)

- [Fix inet_pton tests triggering an assert in Haiku #4141](https://github.com/libgit2/libgit2/pull/4141)

- [README: Mention how to run tests #4139](https://github.com/libgit2/libgit2/pull/4139)

- [tests: Add create__symbolic_with_arbitrary_content #4138](https://github.com/libgit2/libgit2/pull/4138)

- [appveyor: don't rewrite the system mingw #4137](https://github.com/libgit2/libgit2/pull/4137)

- [Introduce (optional) SHA1 collision attack detection #4136](https://github.com/libgit2/libgit2/pull/4136)

- [Provide error on gcc < 4.1 when THREADSAFE #4135](https://github.com/libgit2/libgit2/pull/4135)

- [fix regression from #4092 #4133](https://github.com/libgit2/libgit2/pull/4133)

- [Attrcache cleanups #4131](https://github.com/libgit2/libgit2/pull/4131)

- [Improve clar messages #4130](https://github.com/libgit2/libgit2/pull/4130)

- [Minor comment fix #4127](https://github.com/libgit2/libgit2/pull/4127)

- [refdb: catch additional per-worktree refs #4124](https://github.com/libgit2/libgit2/pull/4124)

- [Signature cleanups #4122](https://github.com/libgit2/libgit2/pull/4122)

- [Changes to provide option to turn off/on ofs_delta #4115](https://github.com/libgit2/libgit2/pull/4115)

- [khash cleanups #4092](https://github.com/libgit2/libgit2/pull/4092)

- [fsync all the things #4030](https://github.com/libgit2/libgit2/pull/4030)

- [Worktree implementation #3436](https://github.com/libgit2/libgit2/pull/3436)

- [Parallelize checkout_create_the_new for ntfs perf gains #4205](https://github.com/libgit2/libgit2/pull/4205)

- [negotiate always fails via libcurl #4126](https://github.com/libgit2/libgit2/pull/4126)

- [Fix proxy auto detect not utilizing callbacks #4097](https://github.com/libgit2/libgit2/pull/4097)