chore: Add changelog

CHANGELOG.md

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+<!-- markdownlint-disable MD013 -->
+<!-- markdownlint-disable MD024 -->
+
+<!--
+Changelog 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 PR referenced in the following format:
+
+* (<tag>) [#<PR-number>](https://github.com/ojo-network/price-feeder/pull/<PR-number>) <changelog entry>
+
+Types of changes (Stanzas):
+
+State Machine Breaking: for any changes that result in a divergent application state.
+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 client breaking changes.
+API Breaking: for breaking exported Go APIs used by developers.
+Config: updates to the recommended configuration files
+
+To release a new version, ensure an appropriate release branch exists. Add a
+release version and date to the existing Unreleased section which takes the form
+of:
+
+## [<version>](https://github.com/ojo-network/price-feeder/releases/tag/<version>) - YYYY-MM-DD
+
+Once the version is tagged and released, a PR should be made against the main
+branch to incorporate the new changelog updates.
+
+Ref: https://keepachangelog.com/en/1.0.0/
+-->
+
+# Changelog
+
+## [Unreleased]
+
+## [v0.1.5](https://github.com/ojo-network/price-feeder/releases/tag/v0.1.6-rc1) - 2023-08-10
+
+
+### Features
+
+- [210](https://github.com/ojo-network/price-feeder/pull/210) Error handling updates
+
+### Improvements
+- [220](https://github.com/ojo-network/price-feeder/pull/220) Change OsmosisV2 provider to Osmosis
+
+### Config
+
+- [215](https://github.com/ojo-network/price-feeder/pull/215) Add rETH to sample config
+
+## [v0.1.5](https://github.com/ojo-network/price-feeder/releases/tag/v0.1.5) - 2023-08-10
+
+### Features
+
+- [192](https://github.com/ojo-network/price-feeder/pull/192) Skip specific denoms in integration test.
+- [157](https://github.com/ojo-network/price-feeder/pull/157) Add Kujira provider.
+- [137](https://github.com/ojo-network/price-feeder/pull/137) Uniswap v3 integration.
+
+### Config
+
+- [183](https://github.com/ojo-network/price-feeder/pull/183) Add SCRT, JUNO, and stJUNO to sample config.