docs(changelog) introduce changelog and add for v0.2.0

CHANGELOG.md

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+# Table of Contents
+
+- [v0.2.0](#v020---20190401)
+- [v0.1.0](#v010---20190112)
+
+## [v0.2.0] - 2019/04/01
+
+### Breaking changes
+
+No breaking changes have been introduced in this release.
+
+### Added
+
+- **Consumers and consumer-level plugins** can now be exported from Kong and
+  synced to Kong.
+- `--skip-consumers` flag has been introduced to various sub-commands to skip
+  management of consumers in environments where they are created dynamically.`
+- **Authentication support**: custom HTTP Headers (key:value) can be injected
+  into requests that decK makes to Kong's Admin API using the `--headers`
+  CLI flag.
+  [#1](https://github.com/hbagdi/deck/pull/1)  
+  Thanks to @davidcv5 for the contribution.
+
+### Fixed
+
+- Infinite loop in pagination for exporting entities in Kong
+  [#2](https://github.com/hbagdi/deck/pull/2)  
+  Thanks to @lmika for the contribution.
+- Plugins are updated using PUT requests instead of PATCH to
+  avoid any schema violations.
+
+## [v0.1.0] - 2019/01/12
+
+### Summary
+
+Debut release of decK
+
+[v0.2.0]: https://github.com/hbagdi/deck/compare/v0.1.0...v0.2.0
+[v0.1.0]: https://github.com/hbagdi/deck/compare/0c7e839...v0.1.0