add: update changelog.

CHANGELOG.md

@@ -1,5 +1,13 @@
-## [Unreleased]
-
-## [0.1.0] - 2021-07-22
+## [0.0.2] - 2021-09-17
+### Changed
+- `ancestors` and `children` frontmatter variables contain url strings instead of jekyll documents.
+### Removed
+- Graph functionality (moved to [jekyll-graph](https://github.com/manunamz/jekyll-graph/)).
 
+## [0.0.1] - 2021-07-22
 - Initial release
+### Added
+- Build tree data structure from filename namespaces with dot delimiters.
+- Add `ancestors` and `children` frontmatter variables.
+- Build d3 graph data for hierarchical graph.
+- Helper functions to retrieve `relatives` and `neighbors` for tree and net-web graphs respectively (accessed in [jekyll-graph](https://github.com/manunamz/jekyll-graph/)).