docs(CHANGELOG): 4.0.2

Author: luin

Changelog.md

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+<a name="4.0.2"></a>
+## [4.0.2](https://github.com/luin/ioredis/compare/v4.0.0...v4.0.2) (2018-10-09)
+
+
+### Bug Fixes
+
+* **cluster:** robust solution for pub/sub in cluster ([#697](https://github.com/luin/ioredis/issues/697)) ([13a5bc4](https://github.com/luin/ioredis/commit/13a5bc4)), closes [#696](https://github.com/luin/ioredis/issues/696)
+* **cluster:** subscription regards password setting ([47e2ab5](https://github.com/luin/ioredis/commit/47e2ab5)), closes [#718](https://github.com/luin/ioredis/issues/718)
+
+
+### Performance Improvements
+
+* reduce package bundle size ([eb68e9a](https://github.com/luin/ioredis/commit/eb68e9a))
+
+
+
 <a name="4.0.1"></a>
 ## [4.0.1](https://github.com/luin/ioredis/compare/v4.0.0...v4.0.1) (2018-10-08)