Add CHANGELOG

CHANGELOG.md

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+# Changelog
+
+[ISO 8601](https://xkcd.com/1179/).
+
+[Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+TODO
+
+## [0.2.0] - 2019-12-01
+
+The main purpose of the release is to simplify installation.
+
+## Changes
+- All configuration moved to `~/.out-of-tree`.
+- Now prebuilt images can be downloaded with bootstrap.
+- Ability to generate kernels specific to .out-of-tree.toml in current
+  directory. So now there's no need to wait for several hours for
+  start work on specific kernel with module/exploit.
+- Now there's no need to keep source tree and _out-of-tree_ can be
+  distributed in binary form.
+- New command: **debug**. Creates interactive environment for kernel
+  module/exploit development. Still work-in-progress.
+
+## [0.1.0] - 2019-11-20
+
+Initial release that was never tagged.
+
+Refer to state after first public release on ZeroNights 2018
+([video](https://youtu.be/2tL7bbCdIio),
+[slides](https://2018.zeronights.ru/wp-content/uploads/materials/07-Ways-to-automate-testing-Linux-kernel-exploits.pdf).
+