[skip ci] update changelog

CHANGELOG.md

@@ -1,2 +1,20 @@
-- INTERNAL
-  - migrate to thegeeklab namespace
+# Changelog
+
+## v0.2.0 (2021-01-03)
+
+### Docs
+
+- add contributing information
+
+### Others
+
+- migrate to poetry
+- replace master by main as default branch
+- **deps**: pin docker digests ([#4](https://github.com/thegeeklab/docker-autotag/issues/4))
+- **docker**: use standalone dockerfiles for multiarch
+- **docker**: switch to org.opencontainers image labels
+- use renovate preset config
+
+### Breaking Changes
+
+- drop Python 3.5 support