docs: add changelog

Author: ravisuhag

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
+
+## [v0.1.1](https://github.com/odpf/columbus/releases/tag/v0.1.1) (2021-04-12)
+
+### Fixes
+
+Fix /v1/types returns null on empty types
+Fix search filter not working as expected
+Fix error when search whitelist is empty when searching
+
+## [v0.1.0](https://github.com/odpf/columbus/releases/tag/v0.1.0) (2021-04-05)
+
+### Features
+
+- Add API to fetch all types
+- Add API to fetch a type
+- Add API to delete a type
+- Add API to delete a record
+- Remove /v1/entities/* APIs.
+- Fix New Relic transaction name not showing detailed route pattern.
+- Implement query time boosting
+- Enable fuzzy search