Begin a CHANGELOG.md for Arti 0.0.1

CHANGELOG.md

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+### Notes
+
+This file describes changes in Arti through the current release.  Once Arti
+is more mature, and we start to version crates independently, we will
+probably switch to using a separate changelog for each crate.
+
+# Arti 0.0.1
+
+This release attempts to be "free of known privacy holes". That
+isn't to say that there are no remaining bugs, but rather that we've
+implemented the missing features that we think are essential for
+basic privacy.
+
+### New features
+
+- Guard relay support... ([#58])
+  - ...with "Lightweight" path bias detection. ([#185])
+- Circuit isolation API. ([#73], [!104])
+- Circuit build timeout inference. ([#57])
+- Persistent state on disk. ([#59])
+- Allow multiple Arti instances to share directories. ([#194])
+- Support for EnforceDistinctSubnets. ([#43])
+- Configurable logging ([!68]) to journald. ([!73])
+- Rejecting attempts to connect to internal addresses. ([#85])
+- Support for Tor `RESOLVE` and `RESOLVE_PTR` [socks extensions]. ([#33])
+- And too many others to list.
+
+### Breaking changes
+
+- Switched from `log` to `tracing`. ([#74])
+- Renamed `arti-tor-client` to `arti-client`. ([#130])
+- Stopped exposing `anyhow` errors. ([#165])
+- CLI now uses `clap`, and uses subcommands. ([!109])
+- Too many others to list.
+
+### Documentation
+
+- New top-level documentation for `arti-client`, with examples. ([!111])
+- Many other improvements and rewrites.
+
+### Infrastructure
+
+- Reproducible builds for Linux ([!69]), Windows ([!70]), and OSX ([!86]).
+- Support for static binaries. ([!69])
+- Simple integration tests, using [chutney] ([!88]).
+
+### Cleanups, minor features, and bugfixes
+
+- Too many to list.
+
+### Acknowledgments
+
+Thanks to everbody who's contributed to this release, including Ben
+Armstead, Daniel Eades, Dimitris Apostolou, Eugene Lomov, Felipe
+Lema, Jani Monoses, Lennart Kloock, Neel Chauhan, S0AndS0, Smitty,
+Trinity Pointard, Yuan Lyu, dagger, and rls!
+
+[#33]: https://gitlab.torproject.org/tpo/core/arti/-/issues/33
+[#43]: https://gitlab.torproject.org/tpo/core/arti/-/issues/43
+[#57]: https://gitlab.torproject.org/tpo/core/arti/-/issues/57
+[#58]: https://gitlab.torproject.org/tpo/core/arti/-/issues/58
+[#59]: https://gitlab.torproject.org/tpo/core/arti/-/issues/59
+[#73]: https://gitlab.torproject.org/tpo/core/arti/-/issues/73
+[#74]: https://gitlab.torproject.org/tpo/core/arti/-/issues/74
+[#85]: https://gitlab.torproject.org/tpo/core/arti/-/issues/85
+[#130]: https://gitlab.torproject.org/tpo/core/arti/-/issues/130
+[#165]: https://gitlab.torproject.org/tpo/core/arti/-/issues/165
+[#185]: https://gitlab.torproject.org/tpo/core/arti/-/issues/185
+[#194]: https://gitlab.torproject.org/tpo/core/arti/-/issues/194
+[!68]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/68
+[!69]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/69
+[!70]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/70
+[!73]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/73
+[!86]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/86
+[!88]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/88
+[!104]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/104
+[!109]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/109
+[!111]: https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/111
+[chutney]: https://gitlab.torproject.org/tpo/core/chutney
+[socks extensions]: https://gitlab.torproject.org/tpo/core/torspec/-/blob/main/socks-extensions.txt
+
+# Arti 0.0.0
+
+Initial release, to reserve our crate names on crates.io.