Add CHANGELOG.md

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this
+file. This change log follows the conventions of
+[keepachangelog.com](http://keepachangelog.com/), with the addition of
+sections for `Highlights`, `Breaking` and `Changes since x.y.z`.
+
+## [Unreleased]
+
+## [0.6.3] - 2020-12-07
+
+### Highlights
+- Allow fast compilation of changed files only. Opt-in. Requires
+  `cryogen-core` version `0.4.0`.
+- Support the use of `tools.deps` (aka clojure CLI) in addition to `lein`.
+
+### Changes since 0.6.2
+- [#225](https://github.com/cryogen-project/cryogen/pull/225) git-ignore lotus' sass-generated files (devurandom)
+- [#221](https://github.com/cryogen-project/cryogen/pull/221) Support for deps tools instead of lein (holyjak)
+- [#220](https://github.com/cryogen-project/cryogen/pull/220) Support for incremental compilation (holyjak)
+
+## [0.6.2] - 2020-10-16
+
+### Highlights
+- Update to new version of the Markup protocol that allows for
+  multiple file extensions for a particular markup. 
+
+### Breaking
+- Requires latest versions of `cryogen-asciidoc` (at least 0.3.2),
+  `cryogen-flexmark` (at least 0.1.4), and `cryogen-markdown` (at
+  least 0.1.13).
+
+### Changes since 0.6.1
+- [#217](https://github.com/cryogen-project/cryogen/pull/217) Update README.md to current year (hewrin)
+- [#216](https://github.com/cryogen-project/cryogen/pull/216) Fix typo in QuickStart template content (daemianmack)
+- [#213](https://github.com/cryogen-project/cryogen/pull/213) Use Markup protocol defined in cryogen-core.markup (darth10)
+
+## [0.6.1] - 2020-03-10
+
+### Highlights
+- Update versions of `cryogen-core` and `cryogen-flexmark`.
+
+### Changes since 0.6.0
+- [#206](https://github.com/cryogen-project/cryogen/pull/206) README: cryogen-markdown => cryogen-flexmark (daemianmack)
+
+## [0.6.0] - 2020-01-20
+
+### Highlights
+- Switch to `cryogen-flexmark`.
+- Handle case where `blog-prefix` is blank.
+
+[Unreleased]: https://github.com/cryogen-project/cryogen/compare/0.6.3...HEAD
+
+[0.6.3]: https://github.com/cryogen-project/cryogen/compare/0.6.2...0.6.3
+[0.6.2]: https://github.com/cryogen-project/cryogen/compare/0.6.1...0.6.2
+[0.6.1]: https://github.com/cryogen-project/cryogen/compare/0.6.0...0.6.1
+[0.6.0]: https://github.com/cryogen-project/cryogen/compare/0.1.0...0.6.0
+