Add a CHANGELOG

CHANGELOG.md

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+# Changelog
+
+## 0.3.0 (2020-02-11)
+
+- This release is compatible with Workplace Search v7.6
+- Changed the package name to `elastic-workplace-search` to follow the product
+  name change ([Announcement](https://www.elastic.co/blog/elastic-enterprise-search-updates-for-7-6-0))
+- Changed API path from `/api/v1/ent/` to `/api/ws/v1/`. If previously
+  using a custom API endpoint you may need to update accordingly.
+
+## 0.2.0 (2019-10-17)
+
+- Changed the `index_documents` and `delete_documents`
+  API methods to be namespaced under `client.documents`.
+  API calls will need to be updated accordingly.
+- Added support for the Permissions API ([#20](https://github.com/elastic/workplace-search-python/pull/20))
+
+## 0.1.0 (2019-08-19)
+
+- Changed "Swiftype" references to "Elastic" in the README and code
+- Changed the package name to `elastic-enterprise-search`
+- Changed versioning to be pre-release again (0.1.0) since we are not yet GA
+  similar to App Search
+- Added analytics HTTP headers `Swiftype-X-Client` and `Swiftype-X-Client-Version`
+- Added Circle CI