add CHANGELOG.md (#506)

CHANGELOG.md

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+<!--
+Guiding Principles:
+
+Changelogs are for humans, not machines.
+There should be an entry for every single version.
+The same types of changes should be grouped.
+Versions and sections should be linkable.
+The latest version comes first.
+The release date of each version is displayed.
+Mention whether you follow Semantic Versioning.
+
+Usage:
+
+Change log entries are to be added to the Unreleased section under the
+appropriate stanza (see below). Each entry should ideally include a tag and
+the Github issue reference in the following format:
+
+* (<tag>) \#<issue-number> message
+
+The issue numbers will later be link-ified during the release process so you do
+not have to worry about including a link manually, but you can if you wish.
+
+Types of changes (Stanzas):
+
+"Features" for new features.
+"Improvements" for changes in existing functionality.
+"Deprecated" for soon-to-be removed features.
+"Bug Fixes" for any bug fixes.
+"Client Breaking" for breaking CLI commands and REST routes used by end-users.
+"API Breaking" for breaking exported APIs used by developers building on SDK.
+"State Machine Breaking" for any changes that result in a different AppState given same genesisState and txList.
+Ref: https://keepachangelog.com/en/1.0.0/
+-->
+
+# Changelog
+
+## [Unreleased]
+
+* Add tendermint `rollback` command to help operators restore to previous height in case of apphash errors
+* Bump Cosmos SDK to `v0.44.4`
+* Bump ibc-go to `v1.2.3`
+* Fix CLI output to stdout/stderr preventing integration with tooling like `jq`
+
+## [v1.0.0](https://github.com/public-awesome/stargaze/releases/tag/v1.0.0) - 2021-10-29
+
+Initial Release