Updated changelog for next release

Author: mitsuhiko

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [Unreleased](https://github.com/mitsuhiko/redis-rs/compare/0.14.0...HEAD) - ReleaseDate
+
+**Fixes and improvements**
+
+* Added support for cargo cluster ([#239](https://github.com/mitsuhiko/redis-rs/pull/239))
+
 ## [0.14.0](https://github.com/mitsuhiko/redis-rs/compare/0.13.0...0.14.0) - 2020-01-08
 
 **Fixes and improvements**